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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Alternative minimum tax and other credit carryforwards $ 962.1 $ 856.9
Accrued and unfunded compensation and employee benefits 156.0 158.8
Amortizable intangible assets 54.3 48.8
Compensation expense related to stock options 11.3 12.2
Accrued liabilities 63.9 63.8
Accrued pension liability 9.9 11.5
Investments 0.9 1.5
Net operating loss carryforwards 37.2 36.8
Capital loss carryforwards 12.6 12.2
Lease liabilities 65.3 4.2
Hedging instruments 11.7 1.9
Other 4.3 3.4
Total deferred tax assets 1,389.5 1,212.0
Valuation allowance for deferred tax assets (80.5) (67.4)
Deferred tax assets 1,309.0 1,144.6
Nondeductible amortizable intangible assets 322.4 297.6
Investment-related partnerships 9.1 13.6
Depreciable fixed assets 22.4 25.4
Right-of-use assets 62.6  
Revenue recognition 63.7 98.1
Other prepaid items 10.6 10.6
Total deferred tax liabilities 490.8 445.3
Net deferred tax assets $ 818.2 $ 699.3