XML 86 R76.htm IDEA: XBRL DOCUMENT v3.20.2
Share and Unit-Based Plans - SARs (Details) - Stock options
 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Units  
Balance at beginning of period (in shares) | shares 35,565
Granted (in shares) | shares 1,950
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 $ 57.32
Granted (in dollars per share) | $ / shares 54.34
Exercised (in dollars per share) | $ / shares 0
Balance at end of period (in dollars per share) | $ / shares $ 54.34