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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Aug. 31, 2012
Domestic Tax Authority [Member]
Mar. 31, 2014
Maximum
Income Tax Disclosures [Line Items]          
Provision (benefit) for taxes on income $ 2.6 $ 8.5      
Federal income tax at statutory rate 35.00%        
Unrecognized Tax Benefits 36.2   35.9    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months 14.5        
Income Tax Examination, Loss Disallowed from Deductions       380.9  
Income Tax Examination, Estimate of Possible Loss         $ 134.0