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Other (Expense) Income, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument, Redemption      
Interest income $ 0.2 $ 0.1 $ 0.4
Realized gain on investments 3.4 0.8 0.8
Loss on extinguishment of debt 0.0 (11.1) 0.0
All other, net 0.9 (0.1) (3.0)
Other income (expense), net $ 4.5 (10.3) $ (1.8)
Senior Notes | Senior Notes Due 2020      
Debt Instrument, Redemption      
Redemption Premium   8.2  
Write off of Deferred Debt Issuance Cost   $ 2.9