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Income Taxes - Provision for Federal and Foreign Income Tax Expense for Continuing Operations (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Taxes [Line Items]      
Loss before income taxes, U.S. $ (286.9) $ (389.2) $ (784.2)
Loss before income taxes, Foreign 21.9 (49.8) (143.1)
Loss before income taxes (265.0) (439.0) (927.3)
CUSA      
Income Taxes [Line Items]      
Loss before income taxes, U.S. (263.7) (362.6) (767.8)
Loss before income taxes, Foreign 21.9 (49.8) (143.1)
Loss before income taxes $ (241.8) $ (412.4) $ (910.9)