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Leases - Schedule of Future Minimum Rental Commitments Under Non-Cancelable Operating Leases (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 67.1
2020 56.9
2021 44.1
2022 32.2
2023 27.7
Thereafter $ 81.6