| Compensation and Retirement Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Compensation and Retirement Disclosure [Abstract] | |
Schedule of Change in Projected Benefit Obligations | The following table sets forth the changes in projected benefit obligations and plan assets of our defined benefit pension and other non-qualified and postretirement plans as of and for the years ended December 31, 2016 and 2015. | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2016 | | 2015 | | 2016 | | 2015 | | (in millions) | Change in Projected Benefit Obligations | | | | | | | | Projected benefit obligations at beginning of year | $ | 283.4 |
| | $ | 291.5 |
| | $ | 3.4 |
| | $ | 3.0 |
| Service cost | 4.3 |
| | 4.9 |
| | 0.1 |
| | 0.1 |
| Interest cost | 12.7 |
| | 12.0 |
| | 0.2 |
| | 0.2 |
| Actuarial loss (gain) | 8.9 |
| | (18.1 | ) | | (0.3 | ) | | (0.4 | ) | Amendments | — |
| | — |
| | — |
| | 0.6 |
| Benefits paid | (18.1 | ) | | (9.9 | ) | | (0.2 | ) | | (0.1 | ) | Benefit obligations assumed in business combination | — |
| | 5.2 |
| | — |
| | — |
| Other | (1.5 | ) | | (2.2 | ) | | — |
| | — |
| Projected benefit obligations at end of year | 289.7 |
| | 283.4 |
| | 3.2 |
| | 3.4 |
|
|
Schedule of Change in Plan Assets | | | | | | | | | | | | Change in Plan Assets | | | | | | | | Fair value of plan assets at beginning of year | 242.5 |
| | 253.1 |
| | | | | Actual return on plan assets | 17.3 |
| | (3.8 | ) | | | | | Administrative expenses | (0.4 | ) | | (0.5 | ) | | | | | Benefits paid | (18.1 | ) | | (9.9 | ) | | | | | Company contributions | 15.6 |
| | 0.7 |
| | | | | Plan assets acquired in business combination | — |
| | 2.9 |
| | | | | Fair value of plan assets at end of year | 256.9 |
| | 242.5 |
| | | | |
|
Schedule of Change in Plan Assets Underfunded Status at End of Year | | | | | | | | | | | | | | | | | | Underfunded Status at End of Year | $ | (32.8 | ) | | $ | (40.9 | ) | | $ | (3.2 | ) | | $ | (3.4 | ) |
|
Schedule Of Projected Benefit Obligations Amounts Recognized In Consolidated Balance Sheets | | | | | | | | | | | | | | | | | | Amounts Recognized in the Consolidated Balance Sheets | | | | | | | | Current liabilities | $ | (0.4 | ) | | $ | (0.2 | ) | | $ | (0.1 | ) | | $ | (0.1 | ) | Long-term liabilities | (32.4 | ) | | (40.7 | ) | | (3.1 | ) | | (3.3 | ) | | $ | (32.8 | ) | | $ | (40.9 | ) | | $ | (3.2 | ) | | $ | (3.4 | ) |
|
Schedule of Pre Tax Charges Recognized in Accumulated Other Comprehensive Income (Loss) | Pre-tax charges recognized in accumulated other comprehensive loss as of December 31, 2016 and 2015 consist of: | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2016 | | 2015 | | 2016 | | 2015 | | (in millions) | Net actuarial (gain) loss | $ | 78.4 |
| | $ | 77.1 |
| | $ | (0.4 | ) | | $ | (0.5 | ) | Prior service cost | 1.2 |
| | 1.4 |
| | 0.4 |
| | 0.7 |
| | $ | 79.6 |
| | $ | 78.5 |
| | $ | — |
| | $ | 0.2 |
|
|
Schedule Of Net Periodic Benefit Cost | | | | | | | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | | (in millions) | Net Periodic Benefit Cost | | | | | | | | | | | | Service cost | $ | 4.3 |
| | $ | 4.9 |
| | $ | 5.2 |
| | $ | 0.1 |
| | $ | 0.1 |
| | $ | 0.1 |
| Interest cost | 12.7 |
| | 12.0 |
| | 11.8 |
| | 0.2 |
| | 0.2 |
| | 0.1 |
| Expected return on plan assets | (17.2 | ) | | (18.2 | ) | | (16.3 | ) | | — |
| | — |
| | — |
| Amortization of prior service cost | 0.2 |
| | 0.2 |
| | 0.1 |
| | 0.1 |
| | — |
| | — |
| Amortization of net loss | 6.9 |
| | 6.9 |
| | 2.5 |
| | — |
| | — |
| | — |
| Curtailment | (0.1 | ) | | — |
| | — |
| | (0.3 | ) | | — |
| | — |
| Deconsolidation of GST | (0.9 | ) | | (0.7 | ) | | (0.3 | ) | | — |
| | — |
| | — |
| Net periodic benefit cost | 5.9 |
| | 5.1 |
| | 3.0 |
| | 0.1 |
| | 0.3 |
| | 0.2 |
|
|
Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income | | | | | | | | | | | | | | | | | | | | | | | | | | Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income | | | | | | | | | | | | Net loss (gain) | 8.2 |
| | 3.3 |
| | 39.9 |
| | (0.4 | ) | | (0.4 | ) | | (0.2 | ) | Prior service cost | — |
| | — |
| | 0.5 |
| | — |
| | 0.6 |
| | — |
| Amortization of net loss | (6.9 | ) | | (6.9 | ) | | (2.5 | ) | | — |
| | — |
| | — |
| Amortization of prior service cost | (0.2 | ) | | (0.2 | ) | | (0.1 | ) | | (0.1 | ) | | — |
| | — |
| Other adjustment | — |
| | (0.1 | ) | | (0.3 | ) | | 0.3 |
| | — |
| | — |
| Total recognized in other comprehensive income | 1.1 |
| | (3.9 | ) | | 37.5 |
| | (0.2 | ) | | 0.2 |
| | (0.2 | ) | Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | $ | 7.0 |
| | $ | 1.2 |
| | $ | 40.5 |
| | $ | (0.1 | ) | | $ | 0.5 |
| | $ | — |
|
|
Schedule of Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Benefits | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31 | | | | | | | | | | | | Discount rate | 4.25 | % | | 4.63 | % | | 4.25 | % | | 4.25 | % | | 4.63 | % | | 4.25 | % | Rate of compensation increase | 3.0 | % | | 3.0 | % | | 3.0 | % | | 4.0 | % | | 4.0 | % | | 4.0 | % | Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended December 31 | | | | | | | | | | | | Discount rate | 4.63 | % | | 4.25 | % | | 5.0 | % | | 4.63 | % | | 4.25 | % | | 5.0 | % | Expected long-term return on plan assets | 7.25 | % | | 7.25 | % | | 8.0 | % | | — |
| | — |
| | — |
| Rate of compensation increase | 3.0 | % | | 3.0 | % | | 3.0 | % | | 4.0 | % | | 4.0 | % | | 4.0 | % |
|
Schedule of Assumed Health Care Cost Trend Rates | We use the RP-2014 mortality table with the MP-2016 projection scale to value our domestic pension liabilities. | | | | | | | Assumed Health Care Cost Trend Rates at December 31 | 2016 | | 2015 | Health care cost trend rate assumed for next year | 8.0 | % | | 6.7 | % | Rate to which the cost trend rate is assumed to decline (the ultimate rate) | 4.5 | % | | 5.0 | % | Year that the rate reaches the ultimate trend rate | 2024 |
| | 2025 |
|
|
Schedule of Asset Allocation for Pension Plans and Target Allocation By Asset Category | The asset allocation for pension plans at the end of 2016 and 2015, and the target allocation for 2017, by asset category are as follows: | | | | | | | | | | | Target Allocation | | Plan Assets at December 31, | | 2017 | | 2016 | | 2015 | Asset Category | | | | | | Equity securities | 40 | % | | 40 | % | | 39 | % | Fixed income | 60 | % | | 60 | % | | 61 | % | | 100 | % | | 100 | % | | 100 | % |
|
Schedule of Fair Value of Plan Assets | The investment portfolios of the various funds at December 31, 2016 and 2015 are summarized as follows: | | | | | | | | | | 2016 | | 2015 | | (in millions) | Mutual funds – U.S. equity | $ | 65.7 |
| | $ | 63.5 |
| Fixed income treasury and money market | 153.3 |
| | 146.4 |
| Mutual funds – international equity | 37.0 |
| | 31.8 |
| Cash equivalents | 0.9 |
| | 0.8 |
| | $ | 256.9 |
| | $ | 242.5 |
|
|
Schedule of Benefit Payments Reflecting Expected Future Service as Appropriate Expected to Be Paid | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid: | | | | | | | | | | Pension Benefits | | Other Benefits | | (in millions) | 2017 | $ | 12.4 |
| | $ | 0.7 |
| 2018 | 12.9 |
| | 0.2 |
| 2019 | 13.8 |
| | 0.3 |
| 2020 | 15.0 |
| | 1.1 |
| 2021 | 15.6 |
| | 0.3 |
| Years 2021 – 2025 | 89.5 |
| | 0.8 |
|
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