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Cash, Cash Equivalents and Restricted Cash - Summary of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Restricted Cash and Cash Equivalents [Abstract]      
Cash and cash equivalents $ 311.1 $ 187.1 $ 425.3
Restricted cash included in other assets 3.2   3.2
Total cash, cash equivalents and restricted cash $ 314.3   $ 428.5