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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Q3-Q4 2017 $ 0.3
2018 255.3
2019 1,167.0
2020 74.0
2021 103.8
2022 88.3
Thereafter 19.3
Total debt, excluding unamortized issuance costs and discounts $ 1,708.0