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Incentive Plans (Summary of Restricted Stock Units Activity) (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Time-Based Restricted Stock Units  
Number of Shares (in shares)  
Beginning balance (in shares) | shares 198,915
Granted (in shares) | shares 55,395
Vested and issued (in shares) | shares (59,324)
Forfeited (in shares) | shares (8,680)
Ending balance (in shares) | shares 186,306
Weighted Average Grant Date Fair Value (in dollars per share)  
Beginning balance (in dollars per share) | $ / shares $ 70.58
Granted (in dollars per share) | $ / shares 90.64
Vested and issued (in dollars per share) | $ / shares 66.31
Forfeited (in dollars per share) | $ / shares 78.06
Ending balance (in dollars per share) | $ / shares $ 77.56
Total fair value, vested | $ $ 6.4
Total fair value, outstanding | $ $ 23.9
Performance Units  
Number of Shares (in shares)  
Beginning balance (in shares) | shares 131,200
Granted (in shares) | shares 64,050
Vested and issued (in shares) | shares (65,745)
Forfeited (in shares) | shares (405)
Ending balance (in shares) | shares 129,100
Weighted Average Grant Date Fair Value (in dollars per share)  
Beginning balance (in dollars per share) | $ / shares $ 82.98
Granted (in dollars per share) | $ / shares 123.65
Vested and issued (in dollars per share) | $ / shares 85.04
Forfeited (in dollars per share) | $ / shares 65.75
Ending balance (in dollars per share) | $ / shares $ 97.19
Total fair value, vested | $ $ 7.0
Total fair value, outstanding | $ $ 16.6
Restricted Stock Units | 2013 Stock Plan For Non-Employee Directors  
Number of Shares (in shares)  
Beginning balance (in shares) | shares 33,607
Granted (in shares) | shares 9,744
Vested and issued (in shares) | shares (12,404)
Ending balance (in shares) | shares 30,947
Weighted Average Grant Date Fair Value (in dollars per share)  
Beginning balance (in dollars per share) | $ / shares $ 70.68
Granted (in dollars per share) | $ / shares 105.33
Vested and issued (in dollars per share) | $ / shares 66.01
Ending balance (in dollars per share) | $ / shares $ 83.46
Total fair value, vested | $ $ 1.3
Total fair value, outstanding | $ $ 4.0