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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Aug. 31, 2012
Domestic Tax Authority [Member]
Sep. 30, 2013
Maximum
Income Tax Disclosures [Line Items]            
Provision (benefit) for taxes on income $ 17.0 $ 13.5 $ 34.8 $ 40.4    
Federal income tax at statutory rate     35.00%      
Unrecognized Tax Benefits 42.5 55.6 42.5 55.6    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months     33.4      
Income Tax Examination, Loss Disallowed from Deductions         380.9  
Income Tax Examination, Estimate of Possible Loss           $ 134.0