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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2012
Share-based Compensation [Abstract]  
Schedule of Stock-Based Compensation Expense
Total compensation expense recognized in the consolidated financial statements for all outstanding share based awards, was as follows (in millions):
 
Quarter Ended March 31,
 
2012
 
2011
Stock-based compensation expense
$
1.4

 
$
1.3