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Share and Unit-Based Plans - SARs (Details) - Stock options
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Units  
Balance at beginning of period (in shares) | shares 37,515
Granted (in shares) | shares 0
Exercised (in shares) | shares 0
Balance at end of period (in shares) | shares 37,515
Value  
Balance at beginning of period (in dollars per share) | $ / shares $ 54.34
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 0
Balance at end of period (in dollars per share) | $ / shares $ 54.34