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Commitments and Contingencies - Schedule of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash outflows $ 81.8 $ 81.6
Right-of-use assets obtained in exchange for lease obligations    
Operating leases $ 109.0 $ 66.9