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Stock-Based Compensation Plans Restricted Stock Units (Details) - Restricted stock units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock Units [Abstract]      
Non-vested at beginning of year 65,406    
Granted 44,761    
Vested (56,786)    
Forfeited (5,673)    
Non-vested at end of year 47,708 65,406  
Weighted Average Grant Date Fair Value [Abstract]      
Non-vested at beginning of year $ 83.55    
Granted 70.64 $ 98.24 $ 89.44
Vested 74.56    
Forfeited 88.68    
Non-vested at end of year 81.52 83.55  
Weighted average grant date fair value granted during year $ 70.64 $ 98.24 $ 89.44
Total fair value of restricted stock units that vested during year $ 4.2 $ 4.4 $ 14.3