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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)

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