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Debt - Debt Outstanding Matures on Calendar Year Basis (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]  
Q4 2018 $ 0.0
2018 410.5
2019 74.0
2020 103.8
2021 88.3
2022 108.4
Thereafter 19.3
Total debt $ 804.3