Schedule of Shares Repurchased - Schedule of Repurchases (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | |||||
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
|
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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 |