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Indebtedness (Maturities of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Aggregate scheduled maturities of long-term debt, excluding current maturities    
2021 $ 297.4  
2022 170.2  
2023 277.7  
2024 2.3  
Thereafter 444.2  
Total indebtedness, less current portion $ 1,191.8 $ 1,275.3