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Stock-Based Compensation Plans Restricted Stock Awards (Details) - Restricted Stock Awards - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock Shares [Abstract]      
Non-vested at beginning of year 124,239    
Granted 95,092    
Vested (61,741)    
Forfeited (2,789)    
Non-vested at end of year 154,801 124,239  
Weighted Average Grant Date Fair Value [Abstract]      
Non-vested at beginning of year $ 90.54    
Granted 79.30 $ 98.18 $ 90.12
Vested 84.82    
Forfeited 94.89    
Non-vested at end of year 85.84 90.54  
Weighted average grant date fair value granted during year $ 79.30 $ 98.18 $ 90.12
Total fair value of restricted stock awards that vested during year $ 5.2 $ 5.1 $ 11.3