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Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Deferred Tax Assets |  |  |
State net operating loss carryforwards | $ 26.5 | $ 26.5 | $ 23.9
Deferred compensation | 25.6 | 25.6 | 23.9
Foreign tax credit carryforwards | 8.9 | 8.9 | 20.1
Tax benefit of uncertain tax positions | 16.6 | 16.6 | 17.6
Accrued expenses | 10.5 | 10.5 | 6.0
Capital loss carryforwards | 1.5 | 1.5 | 1.5
Total deferred tax assets | 89.6 | 89.6 | 93.0
Valuation allowance | (23.2) | (23.2) | (21.3)
Deferred tax assets, net of valuation allowance | 66.4 | 66.4 | 71.7
Deferred Tax Liabilities |  |  |
Intangible asset amortization | (254.9) | (254.9) | (238.2)
Convertible securities interest | (191.8) | (191.8) | (189.2)
Non-deductible intangible amortization | (111.7) | (111.7) | (120.1)
Deferred revenue | (11.0) | (11.0) | (18.5)
Other | (2.8) | (2.8) | (2.8)
Total deferred tax liabilities | (572.2) | (572.2) | (568.8)
Net deferred tax liability | (505.8) | (505.8) | (497.1)
State net operating loss carryforwards, expiration period |  | 15 years |
Foreign tax credit carryforwards, expiration period |  | 10 years |
Liability for uncertain tax positions including interest and related charges | 21.1 | 21.1 |
Accrued income tax interest and related charges | 2.1 | 2.1 |
Unrecognized tax benefits that, if recognized, would affect effective tax rate | 17.8 | 17.8 |
Deferred tax liability transferred to stockholders' equity | $ 5.7 |  |

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