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Commitments and Contingencies Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments [Abstract]      
2020 $ 25.2    
2021 23.8    
2022 19.4    
2023 9.5    
2024 5.6    
After 2024 7.2    
Operating Leases, Rent Expense $ 25.3 $ 30.3 $ 24.9