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Goodwill and Other Intangible Assets (Amortization Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of other intangible assets $ 21.8 $ 18.8 $ 10.7
Finite-lived intangible assets, next twelve months 23.9    
Finite-lived intangible assets, year two 30.5    
Finite-lived intangible assets, year three 29.7    
Finite-lived intangible assets, year four 28.4    
Finite-lived intangible assets, year five and thereafter 138.9    
Total (1) 251.4    
Indefinite-lived intangible assets $ 8.6