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Share and Unit-Based Plans - Stock Awards and Stock Units Roll Forward Activity (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Stock awards      
Shares or Units      
Balance at beginning of year (shares) | shares 1,612 9,189 19,001
Granted (shares) | shares 0 0 0
Vested (shares) | shares (1,612) (7,577) (9,812)
Balance at end of year (shares) | shares 0 1,612 9,189
Weighted Average Grant Date Fair Value      
Balance at beginning of year (in dollars per share) | $ / shares $ 62.01 $ 59.25 $ 56.77
Granted (in dollars per share) | $ / shares 0.00 0.00 0.00
Vested (in dollars per share) | $ / shares 62.01 58.67 54.45
Balance at end of year (in dollars per share) | $ / shares $ 0.00 $ 62.01 $ 59.25
Stock units      
Shares or Units      
Balance at beginning of year (shares) | shares 132,086 144,374 137,318
Granted (shares) | shares 85,601 77,282 75,309
Vested (shares) | shares (69,259) (86,761) (68,253)
Forfeited (shares) | shares 0 (2,809) 0
Balance at end of year (shares) | shares 148,428 132,086 144,374
Weighted Average Grant Date Fair Value      
Balance at beginning of year (in dollars per share) | $ / shares $ 74.58 $ 59.94 $ 57.24
Granted (in dollars per share) | $ / shares 79.22 86.53 60.50
Vested (in dollars per share) | $ / shares 71.82 61.29 55.14
Forfeited (in dollars per share) | $ / shares 0.00 86.72 0.00
Balance at end of year (in dollars per share) | $ / shares $ 78.53 $ 74.58 $ 59.94
Number of common shares into which units can be converted (shares) 1