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Additional Consolidated Income Statement and Cash Flow Information - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Interest and other investment income $ 2.7 $ 4.6 $ 2.0
Income taxes paid 210.4 221.6 195.2
Cash paid for interest $ 86.2 $ 84.9 $ 83.6