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Debt - Scheduled Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Debt    
2020 $ 117.2  
2021 216.1  
2022 317.5  
2023 450.9  
2024 15.4  
Thereafter 2,322.0  
Total debt $ 3,439.1 $ 3,673.5