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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Q4 2017 $ 0.0
2018 0.0
2019 1,225.8
2020 74.0
2021 103.8
2022 88.3
Thereafter 19.3
Total debt, excluding unamortized issuance costs and discounts $ 1,511.2