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Stock Repurchase Plan Stock Repurchase Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock Repurchase Plan [Abstract]    
Authorized common stock repurchase amount $ 1,250.0  
Share Repurchase Program, Total Shares Repurchased 37,053,383  
Common stock repurchased, shares 58,730 0
Share Repurchase Program, Aggregate Purchase Price of All Shares Repurchased $ 996.1