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Income Taxes - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Expense (Benefit) $ 16.7 $ (10.4) $ 13.5 $ (4.2)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%      
CARES Act Tax Benefit   $ 7.1   $ 7.1