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Indebtedness (Maturities of Long-term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Aggregate scheduled maturities of long-term debt, excluding current maturities    
2019 $ 230.9  
2020 303.2  
2021 173.6  
2022 397.5  
Thereafter 170.1  
Total indebtedness, less current portion $ 1,275.3 $ 1,618.1