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Goodwill and Intangible Assets (Future amortization expense) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2017 $ 8.8    
2018 8.8    
2019 7.3    
2020 6.1    
2021 5.9    
2022 and thereafter 43.9    
Net carrying value $ 80.8 $ 92.7 $ 22.4