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Income Taxes - Classification of Net Deferred Income Tax Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Long-term deferred income tax assets | $ 528.8 | $ 646.8
Long-term deferred income tax liabilities | (83.3) | (91.4)
Net deferred income tax asset | $ 445.5 | $ 555.4

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