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Stockholders' Equity and Earnings Per Share (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 29 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Dec. 31, 2012
Stockholders' Equity Note [Abstract]        
Purchase of common stock (in shares) 2.1   31.1  
Amount used to repurchase of common stock $ 67.0   $ 892.5  
Average cost per share of common stock (in dollars per share) $ 31.40   $ 28.69  
Repurchased Shares Pending Settlement 0.3   0.3  
Repurchased Shares Pending Settlement Included Within Other Accrued Liabilities 9.5   9.5  
Quarterly dividend per share (in dollars per share) $ 0.235      
Cash dividends declared 84.9 81.5    
Quarterly dividend payable $ 84.9   $ 84.9 $ 84.9