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Debt - Maturities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Annual maturities of debt:      
2020 $ 0.5    
2021 1.7    
2022 111.1    
2023 15.4    
2024 115.0    
Thereafter 569.6    
Total debt 813.3 $ 341.1  
Decrease in net interest expense 0.6    
Interest expense 16.0 $ 12.6 $ 15.4
U.S. to Swiss Franc cross-currency and interest rate swap agreements      
Annual maturities of debt:      
Notional Amount 150.0    
U.S. to Euro cross-currency and interest rate swap agreements      
Annual maturities of debt:      
Notional Amount $ 355.0