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Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Balance Sheet Related Disclosures [Abstract] |  |
Deferred compensation plan assets | $ 38.1 | $ 38.9
Deferred tax assets | 66.4 | 79.3
Deferred compensation plan liabilities | 63.4 | 62.4
Deferred income tax liabilities | $ 21.1 | $ 21.4

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