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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Aug. 31, 2012
Domestic Tax Authority [Member]
Income Tax Disclosures [Line Items]            
Provision (benefit) for taxes on income $ 19.2 $ 9.3 $ 21.8 $ 17.8    
Federal income tax at statutory rate     35.00%      
Valuation Allowance, Deferred Tax Asset, Change in Amount     9.0      
Unrecognized Tax Benefits 34.2   34.2   35.9  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months     10.9      
Income Tax Examination, Loss Disallowed from Deductions           $ 380.9