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Quarterly Financial Data (Unaudited) - Summary of Restatement of Certain Line Items in the Income Statement (Parenthetical) (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2023
 [1]
Dec. 31, 2022
Dec. 31, 2021
 [1]
Quarterly Financial Information [Line Items]                  
Income Tax Expense (Benefit) $ (12.0) $ (16.0) $ (19.0) $ 149.0 $ 107.0 $ (900.0) $ (7.0) $ (643.0) [1] $ 211.0
Restatement adjustment [Member]                  
Quarterly Financial Information [Line Items]                  
Income Tax Expense (Benefit) (12.0) (16.0) (19.0) $ 154.0 107.0 (900.0)   $ (638.0)  
Maximum [Member] | Restatement adjustment [Member]                  
Quarterly Financial Information [Line Items]                  
Income Tax Expense (Benefit) $ 0.5 $ 0.5 $ 0.5   $ 0.5 $ 0.5      
[1] The financial data presented in the tables above for the year ended December 31, 2022 have been revised as discussed in note 1b.