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Income Taxes - Components of Deferred Tax Asset and Liability (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Asset:    
Employment related accruals $ 51.0 $ 89.7
Foreign tax credit carryover and other credit carryovers 0.2 1.1
Net operating loss carryforwards 100.3 133.1
Total gross deferred tax asset 151.5 223.9
Valuation allowance (90.7) (159.9)
Total deferred tax asset 60.8 64.0
Deferred Tax Liability:    
Intangibles (65.7) (101.7)
Unremitted foreign earnings   (20.9)
Unrealized gain on investment (22.2) (33.5)
Other (5.0) (5.5)
Total deferred tax liability (92.9) (161.6)
Net deferred tax liability (32.1) (97.6)
U.S. [Member]    
Deferred Tax Liability:    
Net deferred tax liability (18.4) (78.0)
International [Member]    
Deferred Tax Liability:    
Net deferred tax liability $ (13.7) $ (19.6)