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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Tax Disclosures [Line Items]          
Provision (benefit) for taxes on income $ 14.7 $ 19.2 $ 13.5 $ 21.8  
Federal income tax at statutory rate     35.00%    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 4.2    
Unrecognized Tax Benefits $ 34.0   34.0   $ 33.3
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months     $ 3.7