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Commitments and Contingencies - Components of Lease Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease Cost [Abstract]    
Operating lease cost $ 26.2 $ 73.4
Variable lease cost 9.9 28.6
Short-term lease cost 0.1 2.4
Sublease income (0.3) (0.9)
Total lease cost $ 35.9 $ 103.5