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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Aug. 31, 2012
Domestic Tax Authority [Member]
Mar. 31, 2013
Maximum
Income Tax Disclosures [Line Items]          
Provision for taxes on income $ 8.5 $ 11.4      
Federal income tax at statutory rate 35.00%        
Unrecognized Tax Benefits 48.1   56.7    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months 5.1        
Income Tax Examination, Loss Disallowed from Deductions       380.9  
Income Tax Examination, Estimate of Possible Loss         $ 134.0