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Share Repurchase Program Share Repurchase Program (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Feb. 25, 2016
Equity [Abstract]    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   25,000,000
Treasury Stock, Value, Acquired, Cost Method $ 45.0  
Treasury stock acquired, shares 1,927,665  
Treasury Stock Acquired, Average Cost Per Share $ 23.34