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Schedule of Shares Repurchased - Schedule of Repurchases (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Amounts attributable to common stockholders Abstract [Abstract]            
Stock Repurchased During Period, Shares 2.8 3.2 2.5 2.7 2.8 2.7
Treasury Stock Acquired, Average Cost Per Share $ 54.24 $ 54.31 $ 50.73 $ 46.69 $ 44.25 $ 37.17
Stock Repurchased During Period, Value $ 150.5 $ 175.0 $ 125.7 $ 124.9 $ 125.0 $ 100.4