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Income Taxes - Classification of Net Deferred Income Tax Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Long-term deferred income tax assets | $ 563.8 | $ 528.8
Long-term deferred income tax liabilities | (86.6) | (83.3)
Net deferred income tax asset | $ 477.2 | $ 445.5

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