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Lease Commitments - Operating Lease, Minimum Rent for Payment (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Lease Commitments And Contingencies [Line Items]  
2019 $ 105.9
2020 102.3
2021 95.6
2022 84.4
2023 81.0
Thereafter 246.5
Total minimum lease payments $ 715.7