Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Leases (Detail)

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Commitments and Contingencies - Leases (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Leases [Line Items]        
Rent expense related to operating leases $ 75.8 $ 67.8 $ 151.8 $ 132.8
Residual Value Guarantee        
Operating Leases [Line Items]        
Maximum guaranteed residual value $ 651.5   $ 651.5