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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Alternative minimum tax and other credit carryforwards $ 683.3 $ 477.9
Accrued and unfunded compensation and employee benefits 143.2 219.0
Amortizable intangible assets 45.8 38.8
Compensation expense related to stock options 13.4 16.9
Accrued liabilities 28.9 31.7
Accrued pension liability 14.8 22.9
Investments 1.1 7.7
Net operating loss carryforwards 30.5 20.4
Capital loss carryforwards 12.9 16.0
Deferred rent liability 4.8 8.1
Other 5.5 3.9
Total deferred tax assets 984.2 863.3
Valuation allowance for deferred tax assets (79.1) (66.8)
Deferred tax assets 905.1 796.5
Nondeductible amortizable intangible assets 273.8 310.2
Investment-related partnerships 17.6 34.5
Depreciable fixed assets 26.5 18.2
Hedging instruments 3.8 4.1
Other prepaid items 10.3 4.1
Total deferred tax liabilities 332.0 371.1
Net deferred tax assets $ 573.1 $ 425.4