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Income Taxes - Current and Deferred Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current:      
Federal $ 1.9 $ 4.0 $ (271.2)
Foreign 9.2 0.8 0.4
State 1.2 1.0 0.3
Total current expense 12.3 5.8 (270.5)
Deferred:      
Federal (2.7) (20.2) (50.5)
Foreign (2.4) 0.4 13.3
State (4.2) (2.8) (1.7)
Total deferred taxes (9.3) (22.6) (38.9)
Income taxes 3.0 (16.8) (309.4)
CUSA      
Current:      
Federal 1.9 4.0 (264.9)
Foreign 9.2 0.8 0.4
State 1.2 1.0 0.3
Total current expense 12.3 5.8 (264.2)
Deferred:      
Federal (16.2) (36.7) (50.9)
Foreign (2.4) 0.4 13.2
State (6.8) (1.8) (1.7)
Total deferred taxes (25.4) (38.1) (39.4)
Income taxes $ (13.1) $ (32.3) $ (303.6)