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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail)
$ in Millions
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Q2-Q4 2017 $ 0.7
2018 500.0
2019 2,345.3
2020 400.0
2021 500.0
2022 550.0
Thereafter 250.0
Total debt, excluding unamortized issuance costs and discounts $ 4,546.0