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Debt - Schedule of Maturities of Long-term Debt (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]  
2018 $ 671.9
2019 919.2
2020 306.8
2021 1,362.0
2022 251.2
Thereafter 7,103.7
Total $ 10,614.8