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Stock-Based Compensation Performance Based Restricted Stock Units (Details)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock Price Based Restricted Stock Unit Awards, Granted During Period, Number 0.2 0.1 0.7
Stock Price Based Restricted Stock Unit Awards, Outstanding At Period End 1.0 0.8  
Stock Price Based Restricted Stock Unit Awards, Outstanding At Period End, Market Condition Met 0.9    
Performance Based Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Performance Share Unit Award Number 0.9    
Share Based Payment Award, Vesting Period 3 years    
Share Based Compensation Arrangement By Share Based Payment Award Performance Share Unit Additional Units Granted Minimum Percentage 0.00%    
Share Based Compensation Arrangement By Share Based Payment Award Performance Share Unit Additional Units Granted Maximum Percentage 200.00%    
Share Based Compensation Arrangement By Share Based Payment Award Performance Share Unit Threshold Award Level Nonvested Number 2.0    
Share Based Compensation Arrangement By Share Based Payment Award Performance Share Unit Award Level Nonvested At Period End Number 2.2    
Share Based Compensation Arrangement By Share Based Payment Award Performance Share Unit Outstanding At Threshold 100.00%    
Minimum [Member] | Stock Price Based RSU [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Payment Award, Vesting Period 1 year    
Maximum [Member] | Stock Price Based RSU [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Payment Award, Vesting Period 7 years