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Income Taxes - Reconciliation of Total Amounts of Unrecognized Tax Benefits Excluding Interest and Penalties (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]      
Beginning Balance $ 55.9 $ 46.5 $ 10.2
Gross increases - tax positions in prior periods 0.0 7.7 32.4
Gross decreases - tax positions in prior periods (0.2) (1.6) (0.1)
Gross increases - current period tax positions 0.1 3.4 4.0
Settlements 0.0 (0.1) 0.0
Ending Balance 55.8 55.9 46.5
CUSA      
Income Taxes [Line Items]      
Beginning Balance 54.0 46.5 10.2
Gross increases - tax positions in prior periods 0.0 5.8 32.4
Gross decreases - tax positions in prior periods (0.2) (1.6) (0.1)
Gross increases - current period tax positions 0.1 3.4 4.0
Settlements 0.0 (0.1) 0.0
Ending Balance $ 53.9 $ 54.0 $ 46.5