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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Amortizable intangible assets:    
Amortizable intangible assets, gross carrying amount $ 34.1 $ 49.6
Amortizable intangible assets, accumulated amortization (16.2) (11.7)
Amortizable intangible assets, net carrying value 17.9 37.9
Total other intangible assets, gross carrying amount 300.1 315.6
Total intangible assets, net 283.9 303.9
Trade name    
Indefinite-lived intangible assets:    
Indefinite-lived intangible assets 266.0 266.0
Customer-related    
Amortizable intangible assets:    
Amortizable intangible assets, gross carrying amount 14.8 14.8
Amortizable intangible assets, accumulated amortization (9.4) (7.7)
Amortizable intangible assets, net carrying value 5.4 7.1
Internally developed software    
Amortizable intangible assets:    
Amortizable intangible assets, gross carrying amount 19.3  
Amortizable intangible assets, accumulated amortization (6.8)  
Amortizable intangible assets, net carrying value 12.5  
Software Development    
Amortizable intangible assets:    
Amortizable intangible assets, net carrying value $ 5.4 26.0
Other    
Amortizable intangible assets:    
Amortizable intangible assets, gross carrying amount   34.8
Amortizable intangible assets, accumulated amortization   (4.0)
Amortizable intangible assets, net carrying value   $ 30.8