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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Alternative minimum tax and other credit carryforwards $ 856.9 $ 683.3
Accrued and unfunded compensation and employee benefits 158.8 141.2
Amortizable intangible assets 48.8 45.8
Compensation expense related to stock options 12.2 13.4
Accrued liabilities 63.8 64.8
Accrued pension liability 11.5 16.8
Investments 1.5 1.1
Net operating loss carryforwards 36.8 30.5
Capital loss carryforwards 12.2 12.9
Deferred rent liability 4.2 4.8
Hedging instruments 1.9  
Other 3.4 5.4
Total deferred tax assets 1,212.0 1,020.0
Valuation allowance for deferred tax assets (67.4) (79.1)
Deferred tax assets 1,144.6 940.9
Nondeductible amortizable intangible assets 297.6 273.8
Investment-related partnerships 13.6 17.6
Depreciable fixed assets 25.4 26.5
Revenue recognition 98.1 80.6
Hedging instruments   3.8
Other prepaid items 10.6 10.3
Total deferred tax liabilities 445.3 412.6
Net deferred tax assets $ 699.3 $ 528.3