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Commitments and Contingencies - Components of Lease Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Cost [Abstract]    
Operating lease cost $ 89.3 $ 94.4
Variable lease cost 32.7 32.4
Sublease income (1.7) (1.2)
Total lease cost $ 120.3 $ 125.6