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Income Taxes (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jan. 01, 2017
Excluding discrete items [Line Items]          
Unrecognized Tax Benefits $ 14.8   $ 14.8   $ 39.1
Provision (benefit) for income taxes $ 21.1 $ 15.2 $ 28.5 $ 65.8  
Effective Income Tax Rate Reconciliation, Percent 28.10% 30.90% 14.10% 30.80%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions     $ 5.6    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions     (1.3)    
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations     $ (28.6)