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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock Shares [Abstract]      
Non-vested at beginning of year 154,801    
Granted 193,036    
Vested (73,961)    
Forfeited (7,506)    
Non-vested at end of year 266,370 154,801  
Weighted Average Grant Date Fair Value [Abstract]      
Non-vested at beginning of year $ 85.84    
Granted 57.11 $ 79.30 $ 98.18
Vested 87.45    
Forfeited 79.30    
Non-vested at end of year 64.76 85.84  
Weighted average grant date fair value granted during year $ 57.11 $ 79.30 $ 98.18
Total fair value of restricted stock awards that vested during year $ 6.5 $ 5.2 $ 5.1