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Shareholders' Equity and Stock-Based Compensation (Details 7) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 18, 2013
Feb. 16, 2012
Jan. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock repurchased (in shares)       3,493,000 3,606,000  
Total cash consideration paid for common stock repurchased       $ 260.2 $ 245.6  
Preferred Stock            
Authorized no par value preferred stock (in shares)       3,000,000 3,000,000 3,000,000
Common Stock In Treasury
            
Authorized repurchase amount under the written trading plan 500.0 350.0        
Common stock repurchased (in shares) 115,000   1,514,000 3,493,000 3,606,000  
Total cash consideration paid for common stock repurchased 11.2   104.4 144.6 245.6  
Common Stock in Treasury            
Decrease in stock by the settlement of restricted stock units       14.2 6.1 12.8
Increase in the stock for common stock surrendered by recipients of restricted stock as a means of funding minimum income tax withholding       $ 11.0 $ 1.8 $ 7.0