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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jul. 28, 2011
Tax Assessment Year 2007 to 2009
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]          
Effective tax rates (as a percent) (16.70%) 17.00% 26.40% 21.00%  
U.S. statutory rate (as a percent)   35.00% 35.00% 35.00%  
Foreign tax credit carryforwards $ 18.7   $ 18.7    
Total tax assessment         87.4
Tax assessments related to disallowed deductions         $ 80.6