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Leases - Schedule of Future Minimum Rental Commitments Under Non-Cancelable Operating Leases (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Leases [Abstract]  
2017 $ 69.5
2018 58.7
2019 47.6
2020 38.9
2021 28.4
Thereafter $ 88.7