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Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Balance Sheet Related Disclosures [Abstract] |  |
Deferred compensation plan assets | $ 31.2 | $ 33.6
Deferred tax assets | 79.1 | 77.5
Deferred compensation plan liabilities | 51.3 | 58.1
Deferred income tax liabilities | $ 7.5 | $ 7.8

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