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Leases - Schedule of Consolidated Statement Of Operation Related To Leases (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating lease cost:    
Operating lease cost $ 49.4 $ 97.6
Variable lease costs 6.0 12.0
Finance lease cost:    
Amortization of leased assets 1.2 2.3
Interest on lease liabilities $ 0.1 $ 0.3