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Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Deferred Tax Assets |  |
State net operating loss carryforwards | $ 24.6 | $ 23.9
Deferred compensation | 24.8 | 23.9
Foreign tax credit carryforwards | 15.9 | 20.1
Tax benefit of uncertain tax positions | 17.1 | 17.6
Accrued expenses | 9.1 | 6.0
Capital loss carryforwards | 1.5 | 1.5
Total deferred tax assets | 93.0 | 93.0
Valuation allowance | (22.2) | (21.3)
Deferred tax assets, net of valuation allowance | 70.8 | 71.7
Deferred Tax Liabilities |  |
Intangible asset amortization | (246.8) | (238.2)
Convertible securities interest | (193.8) | (189.2)
Non-deductible intangible amortization | (113.4) | (120.1)
Deferred revenue | (17.5) | (18.5)
Other | (2.9) | (2.8)
Total deferred tax liabilities | (574.4) | (568.8)
Net deferred tax liability | (503.6) | (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 | 21.9 |
Accrued income tax interest and related charges | 2.2 |
Unrecognized tax benefits that, if recognized, would affect effective tax rate | $ 18.7 |

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