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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail)
$ in Millions
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]  
Q4 2017 $ 0.2
2018 1,600.6
2019 74.0
2020 103.8
2021 88.3
2022 300.0
Thereafter 519.3
Total debt, excluding unamortized issuance costs and discounts $ 2,686.2