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Stock Repurchase Program (Details) (USD $)
Share data in Millions, unless otherwise specified |
0 Months Ended | ||||||||
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Feb. 04, 2015
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Mar. 31, 2015
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Feb. 28, 2015
counterparty
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Feb. 04, 2015
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Jan. 31, 2015
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Dec. 31, 2014
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Oct. 31, 2014
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Jul. 31, 2014
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Jan. 31, 2014
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| Stock Repurchase Program [Abstract] | |||||||||
| Stock Repurchase Program, Authorized Amount | $ 337,000,000 | $ 300,000,000 | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | ||||
| Accelerated Share Repurchases Agreements, Number of Counterparties | 2 | ||||||||
| Accelerated Share Repurchases, Agreement Amount | 300,000,000 | ||||||||
| Accelerated Share Repurchases, Upfront Payment | 300,000,000 | ||||||||
| Stock Repurchased and Retired During Period, Shares | 5.7 | ||||||||
| Stock Repurchase Program, Remaining Amount Authorized to be Repurchased | $ 200,000,000 |