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Stock Repurchase Plan Stock Repurchase Plan (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
shares
Stock Repurchase Plan [Abstract]  
Authorized common stock repurchase amount $ 1,250.0
Common stock repurchased, shares | shares 36,994,653
Common stock repurchased, purchase price $ 994.8