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Stock Repurchase Program (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended
Aug. 16, 2011
Jan. 31, 2013
Aug. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Aug. 31, 2011
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Sep. 30, 2011
Stock Repurchase Program                    
Authorized amount of stock repurchase   $ 500 $ 300     $ 200        
Stock repurchased during period                 200  
Remaining repurchase amount of shares pursuant to the plan               64.6    
Common stock repurchased under the agreement for the ASR 100                  
Shares delivered by Bank of America to the Company                   4.3
Shares repurchased under the ASR agreement         4.8          
Average price per share of stock repurchased under the ASR agreement (in dollars per share)         $ 20.97          
Shares repurchased and retired under the agreement       4.4       10.8    
Average price per share of stock repurchased and retired under the agreement (in dollars per share)       $ 22.59       $ 21.77    
Total cost of shares repurchased under the agreement       $ 100.0       $ 235.4    
Shares repurchased in transactions that were settled in fiscal quarter two of 2013             0.3