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Goodwill and Other Intangible Assets - Goodwill Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill [Roll Forward]        
Goodwill, beginning balance $ 25.9 $ 25.9 $ 25.9 $ 25.9
Amortization of other intangible assets (2.6) (2.5) (5.5) (4.9)
Goodwill, ending balance 25.9 25.9 25.9 25.9
Intangible assets, net (including goodwill), ending balance 492.8   492.8  
Other Intangible Assets        
Goodwill [Roll Forward]        
Intangible assets, net (excluding goodwill), beginning balance 33.3 17.0 36.2 19.3
Amortization of other intangible assets (2.6) (2.6) (5.5) (4.9)
Intangible assets, net (excluding goodwill), ending balance 30.7 14.4 30.7 14.4
Intangible Asset and Goodwill        
Goodwill [Roll Forward]        
Intangible assets, gross (including goodwill), beginning balance 59.2 42.9 62.1 45.2
Amortization of other intangible assets (2.6) (2.6) (5.5) (4.9)
Acquisition of businesses 436.2   436.2  
Intangible assets, net (including goodwill), ending balance 492.8 40.3 492.8 40.3
Intangible assets, gross (including goodwill), ending balanc $ 56.6 $ 40.3 $ 56.6 $ 40.3