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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Other Intangible Assets        
Amortization expense $ 11.9 $ 12.0 $ 23.8 $ 24.0
Amortization expense estimated for each of the next five fiscal years        
Remainder of 2018 23.2   23.2  
2019 42.9   42.9  
2020 37.2   37.2  
2021 32.5   32.5  
2022 24.9   24.9  
2023 $ 22.2   $ 22.2