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Additional Consolidated Income Statement and Cash Flow Information - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Interest and other investment income $ 12.0 $ 1.0 $ 2.0
Income taxes paid 336.2 299.3 245.5
Cash paid for interest $ 66.3 $ 80.2 $ 78.7