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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
Oct. 30, 2014
Oct. 20, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Mar. 25, 2014
Restricted stock, 2013 grant
Sep. 30, 2014
Restricted stock, 2013 grant
May 21, 2014
Restricted stock
Equity                    
Issuance of common stock in connection with the exercise of employee stock options (in shares)     133,068   570,379          
Total proceeds from the exercise of employee stock options     $ 6.6   $ 27.9 $ 61.5        
Common stock quarterly dividend per share, after increase (in dollars per share)   $ 0.35                
Common stock dividend quarterly declared and paid per share (in dollars per share)     $ 0.35 $ 0.33 $ 1.05 $ 0.93        
Dividends paid     27.3 25.4 81.7 71.4        
Share-Based Compensation                    
Restricted stock granted (in shares)               349,380    
Share of common stock               1    
The number of grants made during the period on the basis service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan)                 136,162  
Restricted stock granted                   11,830
Fair value of restricted stock               $ 71.15   $ 70.99
Share Repurchase Program                    
Number of shares repurchased 610,300       0   0      
Average costs per share $ 65.54                  
Value of shares repurchased $ 40.0                  
Remaining number of common stock authorized for repurchase (in shares) 7,272,733