The components of deferred income taxes at December 31 are as follows: | | | | | | | | | | 2013 | | 2012 | Deferred tax assets relating to: | | | | Retirement benefits | $ | 287.8 |
| | $ | 405.3 |
| Accrued expenses | 342.8 |
| | 431.2 |
| Insurance reserves | 213.1 |
| | 221.2 |
| Net operating loss carryforwards | 17.2 |
| | 19.2 |
| Bad debt reserves | 124.8 |
| | 108.2 |
| State income tax | 32.9 |
| | 79.3 |
| Deferred compensation | 52.0 |
| | 55.7 |
| Investment basis difference | 166.3 |
| | 138.2 |
| Other | 84.0 |
| | 47.0 |
| Total deferred tax assets | 1,320.9 |
| | 1,505.3 |
| Valuation allowance | (24.1 | ) | | (18.1 | ) | Total deferred tax assets, net of valuation allowance | 1,296.8 |
| | 1,487.2 |
| Deferred tax liabilities relating to: | | | | Unrealized gains on securities | 266.5 |
| | 431.0 |
| Acquisition related: | | | | Trademarks and other non-amortizable intangible assets | 2,200.5 |
| | 2,200.5 |
| Subscriber base, provider and hospital networks | 370.9 |
| | 447.7 |
| Internally developed software and other amortization differences | 703.9 |
| | 599.3 |
| Retirement benefits | 231.5 |
| | 214.1 |
| Debt discount | 186.9 |
| | 189.7 |
| State deferred tax | 55.3 |
| | 165.9 |
| Depreciation and amortization | 33.1 |
| | 73.9 |
| Other | 190.4 |
| | 151.6 |
| Total deferred tax liabilities | 4,239.0 |
| | 4,473.7 |
| Net deferred tax liability | $ | (2,942.2 | ) | | $ | (2,986.5 | ) | Deferred tax asset-current | $ | 383.0 |
| | $ | 236.4 |
| Deferred tax liability-noncurrent | (3,325.2 | ) | | (3,222.9 | ) | Net deferred tax liability | $ | (2,942.2 | ) | | $ | (2,986.5 | ) |
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