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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Interest expense on income taxes $ 0.0 $ 0.6 $ 0.3
Accrued interest on income taxes 1.3 1.3 0.9
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit (0.6)    
Potential benefit on the effective tax rate 4.4    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits beginning balance 5.0 5.5 6.6
Additions based on tax positions related to the current year   0.1 0.2
Additions for tax positions of prior years 0.0 0.7  
Reductions for tax positions of prior years (0.6) (1.3) (1.3)
Unrecognized Tax Benefits, Increase Resulting from Acquisition 8.4    
Unrecognized tax benefits ending balance $ 12.8 $ 5.0 $ 5.5