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Income Taxes (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Tax Assets      
State net operating loss carryforwards $ 23.9 $ 26.5  
Deferred compensation 23.9 17.5  
Foreign tax credit carryforwards 20.1 15.1  
Tax benefit of uncertain tax positions 17.6 11.6  
Accrued expenses 6.0 11.6  
Capital loss carryforwards 1.5 1.5  
Total deferred tax assets 93.0 83.8  
Valuation allowance (21.3) (35.6)  
Deferred tax assets, net of valuation allowance 71.7 48.2  
Deferred Tax Liabilities      
Intangible asset amortization (238.2) (247.1)  
Convertible securities interest (189.2) (171.1)  
Non-deductible intangible amortization (120.1) (127.2)  
Deferred revenue (18.5) (5.6)  
Other (2.8) (3.2)  
Total deferred tax liabilities (568.8) (554.2)  
Net deferred tax liability (497.1) (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 22.6 21.3 24.6
Accrued income tax interest and related charges 2.2 1.6 3.2
Unrecognized tax benefits that, if recognized, would affect effective tax rate $ 19.4 $ 12.6 $ 16.7