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Indebtedness (Maturities of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Aggregate scheduled maturities of long-term debt, excluding current maturities    
2022 $ 463.5  
2023 304.3  
2024 2.5  
2025 383.8  
Thereafter 102.6  
Total indebtedness, less current portion $ 1,256.7 $ 1,191.8