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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Deferred Tax Assets    
State net operating loss carryforwards $ 27.5 $ 23.9
Deferred compensation 27.2 23.9
Foreign tax credit carryforwards 10.2 20.1
Tax benefit of uncertain tax positions 16.3 17.6
Accrued expenses 11.3 6.0
Capital loss carryforwards 1.5 1.5
Total deferred tax assets 94.0 93.0
Valuation allowance (24.9) (21.3)
Deferred tax assets, net of valuation allowance 69.1 71.7
Deferred Tax Liabilities    
Intangible asset amortization (265.4) (238.2)
Convertible securities interest (142.1) (189.2)
Non-deductible intangible amortization (103.1) (120.1)
Deferred revenue (17.1) (18.5)
Other (2.8) (2.8)
Total deferred tax liabilities (530.5) (568.8)
Net deferred tax liability (461.4) (497.1)
Deferred tax liability transferred to stockholders' equity 50.6  
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 20.9  
Accrued income tax interest and related charges 2.1  
Unrecognized tax benefits that, if recognized, would affect effective tax rate $ 17.7