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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 10.0 $ 10.0 $ 10.0
Gross carrying amount 191.7 191.7  
Accumulated amortization (43.5) (33.4)  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2017 10.0    
2018 10.0    
2019 10.0    
2020 10.0    
2021 10.0    
Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 91.4 91.4  
Accumulated amortization (23.0) (18.6)  
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 35.7 35.7  
Accumulated amortization (7.6) (6.2)  
Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 64.6 64.6  
Accumulated amortization $ (12.9) $ (8.6)