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Goodwill and Other Intangibles (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]            
Goodwill $ 673.5 $ 673.5   $ 673.5   $ 605.6
Other Intangible Assets            
Acquired Finite-Lived Intangible Assets [Line Items]            
Amortization expense related to other intangible assets   4.4 $ 2.3 8.9 $ 4.7  
Estimated future amortization expense for 2018 8.6 8.6   8.6    
Estimated future amortization expense for 2019 17.0 17.0   17.0    
Estimated future amortization expense for 2020 17.0 17.0   17.0    
Estimated future amortization expense for 2021 14.5 14.5   14.5    
Estimated future amortization expense for 2022 9.9 9.9   9.9    
Omnium Technology            
Acquired Finite-Lived Intangible Assets [Line Items]            
Purchase price 73.0          
Intangibles acquired 71.4 71.4   71.4    
Goodwill $ 1.6 $ 1.6   $ 1.6