Fair value hierarchy and related disclosures | The following table shows the fair value of the Company’s financial instruments and where in the fair value hierarchy the fair value measurements are included as of the dates indicated below: | | | | | | | | | | | | | | | | | | | | | December 31, 2016 | Carrying amount |
| Total fair value |
| Level 1 |
| Level 2 |
| Level 3 | ASSETS: | | | | | | | | | | Fixed maturity investments: |
|
|
|
|
|
|
|
|
| U.S. government and government agencies | $ | 1,426.0 |
|
| $ | 1,426.0 |
|
| $ | 1,379.6 |
|
| $ | 46.4 |
|
| $ | — |
| Non-U.S. government and government agencies | 469.9 |
|
| 469.9 |
|
| — |
|
| 469.9 |
|
| — |
| States, municipalities and political subdivisions | 354.1 |
|
| 354.1 |
|
| — |
|
| 354.1 |
|
| — |
| Corporate debt: | | | | | | | | | | Financial institutions | 1,032.7 |
| | 1,032.7 |
| | — |
| | 1,031.2 |
| | 1.5 |
| Industrials | 1,321.3 |
| | 1,321.3 |
| | — |
| | 1,321.3 |
| | — |
| Utilities | 140.0 |
| | 140.0 |
| | — |
| | 140.0 |
| | — |
| Mortgage-backed: | | | | | | | | | | Agency mortgage-backed | 614.5 |
| | 614.5 |
| | — |
| | 475.9 |
| | 138.7 |
| Non-agency residential mortgage-backed | 23.9 |
| | 23.9 |
| | — |
| | 23.9 |
| | — |
| Commercial mortgage-backed | 598.0 |
| | 598.0 |
| | — |
| | 598.0 |
| | — |
| Asset-backed | 757.3 |
|
| 757.3 |
|
|
|
|
| 697.8 |
|
| 59.5 |
| Total fixed maturity investments | 6,737.7 |
|
| 6,737.7 |
|
| 1,379.6 |
| | 5,158.5 |
| | 199.7 |
| Equity securities | 243.9 |
|
| 243.9 |
|
| 219.2 |
|
| — |
|
| 24.7 |
| Other invested assets(1) | 897.8 |
|
| 897.8 |
|
| — |
|
| — |
|
| — |
| Total investments | 7,879.4 |
|
| 7,879.4 |
|
| 1,598.8 |
|
| 5,158.5 |
|
| 224.4 |
| Derivative assets: |
|
|
|
|
|
|
|
|
| Foreign exchange contracts | 10.4 |
|
| 10.4 |
|
| — |
|
| 10.4 |
|
| — |
| Insurance contracts | 7.4 |
|
| 7.4 |
|
| — |
|
| — |
|
| 7.4 |
| LIABILITIES: | | | | | | | | | | Derivative liabilities: |
|
|
|
|
|
|
|
|
| Foreign exchange contracts | 0.1 |
|
| 0.1 |
|
| — |
|
| 0.1 |
|
| — |
| Reinsurance contracts | 4.0 |
|
| 4.0 |
|
| — |
|
| — |
|
| 4.0 |
| Senior notes | 794.2 |
|
| 827.1 |
|
| — |
|
| 827.1 |
|
| — |
| Other long-term debt | $ | 22.0 |
| | $ | 26.7 |
| | $ | — |
| | $ | 26.7 |
| | $ | — |
|
| | | | | | | | | | | | | | | | | | | | | December 31, 2015 | Carrying amount | | Total fair value | | Level 1 | | Level 2 | | Level 3 | ASSETS: | | | | | | | | | | Fixed maturity investments: | | | | | | | | | | U.S. government and government agencies | $ | 1,434.0 |
| | $ | 1,434.0 |
| | $ | 1,396.4 |
| | $ | 37.6 |
| | $ | — |
| Non-U.S. government and government agencies | 556.8 |
| | 556.8 |
| | — |
| | 556.8 |
| | — |
| States, municipalities and political subdivisions | 413.5 |
| | 413.5 |
| | — |
| | 413.5 |
| | — |
| Corporate debt | | | | | | | | | | Financial institutions | 1,275.4 |
| | 1,275.4 |
| | — |
| | 1,275.4 |
| | — |
| Industrials | 1,308.1 |
| | 1,308.1 |
| | — |
| | 1,308.1 |
| | — |
| Utilities | 118.9 |
| | 118.9 |
| | — |
| | 118.9 |
| | — |
| Mortgage-backed | | | | | | | | | | Agency mortgage-backed | 751.8 |
| | 751.8 |
| | — |
| | 650.8 |
| | 101.1 |
| Non-agency residential mortgage-backed | 34.0 |
| | 34.0 |
| | — |
| | 29.0 |
| | 5.0 |
| Commercial mortgage-backed | 582.8 |
| | 582.8 |
| | — |
| | 582.8 |
| | — |
| Asset-backed | 726.2 |
| | 726.2 |
| | — |
| | 663.2 |
| | 63.0 |
| Total fixed maturity investments | 7,201.5 |
| | 7,201.5 |
| | 1,396.4 |
| | 5,636.1 |
| | 169.1 |
| Equity securities | 403.0 |
| | 403.0 |
| | 403.0 |
| | — |
| | — |
| Other invested assets(1) | 840.2 |
| | 840.2 |
| | — |
| | — |
| | — |
| Total investments | 8,444.7 |
| | 8,444.7 |
| | 1,799.4 |
| | 5,636.1 |
| | 169.1 |
| Derivative assets: | | | | | | | | | | Foreign exchange contracts | 0.1 |
| | 0.1 |
| | — |
| | 0.1 |
| | — |
| LIABILITIES: | | | | | | | | | | Derivative liabilities: | | | | | | | | | | Foreign exchange contracts | 3.0 |
| | 3.0 |
| | — |
| | 3.0 |
| | — |
| Interest rate swaps | 0.5 |
| | 0.5 |
| | — |
| | 0.5 |
| | — |
| Senior notes | 1,292.9 |
| | 1,337.9 |
| | — |
| | 1,337.9 |
| | — |
| Other long-term debt | $ | 23.0 |
| | $ | 27.7 |
| | $ | — |
| | $ | 27.7 |
| | $ | — |
|
|
Fair value measurements using significant unobservable inputs (Level 3) | The following is a rollforward of the beginning and ending balance of financial instruments using significant unobservable inputs (Level 3): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fair value measurements using significant unobservable inputs (Level 3): | | Corporate Debt - Financial Institutions | | Agency MBS | | Non-agency RMBS | | CMBS | | Asset-backed |
| Equities | | Insurance contracts | | Reinsurance contracts | Balance at December 31, 2014 | $ | — |
| | $ | 180.1 |
| | $ | — |
| | $ | 1.7 |
| | $ | 55.4 |
|
| $ | 43.3 |
| | $ | — |
| | $ | — |
| Realized and unrealized gains (losses) included in net income | — |
| | (1.0 | ) | | (0.1 | ) | | 0.1 |
| | (6.1 | ) |
| 3.5 |
| | — |
| | — |
| Purchases | — |
| | 17.7 |
| | 5.2 |
| | 1.8 |
| | 18.4 |
|
| — |
| | — |
| | — |
| Sales | — |
| | (95.7 | ) | | (0.1 | ) | | (3.6 | ) | | (23.1 | ) |
| (46.8 | ) | | — |
| | — |
| Transfers into Level 3 from Level 2 | — |
| | — |
| | — |
| | — |
| | 37.3 |
|
| — |
| | — |
| | — |
| Transfers out of Level 3 into Level 2(1) | — |
| | — |
| | — |
| | — |
| | (18.9 | ) |
| — |
| | — |
| | — |
| Balance at December 31, 2015 | $ | — |
| | $ | 101.1 |
| | $ | 5.0 |
| | $ | — |
| | $ | 63.0 |
|
| $ | — |
| | $ | — |
| | $ | — |
| Realized and unrealized gains (losses) included in net income | — |
| | (6.4 | ) | | — |
| | — |
| | 3.1 |
| | 8.1 |
| | 7.4 |
| | (4.0 | ) | Purchases | 1.5 |
| | 212.6 |
| | — |
| | — |
| | 31.2 |
| | 16.6 |
| | — |
| | — |
| Sales | — |
| | (175.3 | ) | | — |
| | — |
| | (27.2 | ) | | — |
| | — |
| | — |
| Transfers into Level 3 from Level 2 | — |
| | 6.7 |
| | — |
| | — |
| | 8.0 |
| | — |
| | — |
| | — |
| Transfers out of Level 3 into Level 2(1) | — |
| | — |
| | (5.0 | ) | | — |
| | (18.6 | ) | | — |
| | — |
| | — |
| Balance at December 31, 2016 | $ | 1.5 |
| | $ | 138.7 |
| | $ | — |
| | $ | — |
| | $ | 59.5 |
| | $ | 24.7 |
| | $ | 7.4 |
| | $ | (4.0 | ) | Realized and unrealized losses (gains) included in net income for investments still held as of December 31, 2016 | $ | — |
| | $ | (6.4 | ) | | $ | — |
| | $ | — |
| | $ | 1.9 |
| | $ | 8.1 |
| | $ | 7.4 |
| | $ | (4.0 | ) | Realized and unrealized gains (losses) included in net income for investments still held as of December 31, 2015 | $ | — |
| | $ | (1.5 | ) | | $ | (0.1 | ) | | $ | — |
| | $ | (0.3 | ) | | $ | — |
| | $ | — |
| | $ | — |
|
(1) Transfers out of Level 3 are primarily attributable to the availability of market observable information. |