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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2011
Jan. 31, 2011
Income Taxes [Abstract]      
Income tax provision$ 17.8$ 116.1$ 312.3$ 282.5  
Effective income tax rate  16.20%31.00%  
Effective income tax rate before discrete items    22.70% 
U.S. statutory tax rate  35.00%   
Increased valuation allowance against deferred tax assets  25.9   
Unrecognized tax benefits     $ 79.8