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Long-Term Debt - Annual Scheduled Principal Payments of Debt (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
Debt Disclosure [Abstract]  
2020 $ 7.3
2021 22.8
2022 27.5
2023 27.5
2024 584.0
Thereafter 1,875.2
Total $ 2,544.3