Share and Unit-Based Plans - SARs (Details) - Stock options	3 Months Ended
	Mar. 31, 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