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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Goodwill and Other Intangible Assets    
Amortization expense $ 11.9 $ 12.0
Amortization expense estimated for each of the next five fiscal years    
Remainder of 2018 35.3  
2019 43.2  
2020 37.4  
2021 32.4  
2022 24.7  
2023 $ 22.2