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Stock-Based Compensation Plans Restricted Stock Awards (Details) - Restricted Stock Awards [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock Shares [Abstract]      
Non-vested at beginning of year 289,016    
Granted 80,400    
Vested (89,346)    
Forfeited (13,976)    
Non-vested at end of year 266,094 289,016  
Weighted Average Grant Date Fair Value [Abstract]      
Non-vested at beginning of year $ 64.74    
Granted 70.56 $ 73.07 $ 57.11
Vested 67.41    
Forfeited 64.96    
Non-vested at end of year 65.59 64.74  
Weighted average grant date fair value granted during year $ 70.56 $ 73.07 $ 57.11
Total fair value of restricted stock awards that vested during year $ 6.0 $ 5.3 $ 6.5