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Long-Term Debt Long-Term Debt (Maturities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Year ended December 31    
2020 $ 51.1  
2021 51.0  
2022 350.2  
2023 51.0  
2024 621.9  
Thereafter 992.4  
Total $ 2,117.6 $ 1,169.0