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Income Taxes (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2011
Deferred Tax Assets      
State net operating loss carryforwards $ 25.6 $ 25.6 $ 26.5
Foreign tax credit carryforwards 13.2 13.2 15.1
Deferred compensation 21.5 21.5 17.5
Tax benefit of uncertain tax positions 17.3 17.3 11.6
Accrued expenses 4.8 4.8 11.6
Capital loss carryforwards 1.6 1.6 1.5
Total deferred tax assets 84.0 84.0 83.8
Valuation allowance (27.3) (27.3) (35.6)
Deferred tax assets, net of valuation allowance 56.7 56.7 48.2
Deferred Tax Liabilities      
Intangible asset amortization (263.7) (263.7) (247.1)
Convertible securities interest (184.5) (184.5) (171.1)
Non-deductible intangible amortization (121.7) (121.7) (127.2)
Deferred revenue (5.3) (5.3) (5.6)
Other (2.9) (2.9) (3.2)
Total deferred tax liabilities (578.1) (578.1) (554.2)
Net deferred tax liability (521.4) (521.4) (506.0)
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 27.9 27.9  
Accrued income tax interest and related charges 2.4 2.4  
Liability for uncertain tax positions for foreign exchange 16.2 16.2  
Increase (Decrease) related to foreign exchange rates $ (5.0)