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Stock Repurchase Plan (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
shares
Stock Repurchase Plan [Abstract]  
Authorized aggregate amount $ 1,250.0
Total number of shares repurchased since inception of our stock repurchase program (shares) | shares 36,994,653
Aggregate purchase price of shares repurchased since inception of our stock repurchase program $ 994.8