Stock-Based Compensation - Summary of Restricted Stock, Stock Grants, Stock Units and Performance Shares (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units, Stock Grants, and Stock Units
Stocks granted and the weighted average fair value
Units granted (in shares)	109,106	132,997	161,963
Grant date fair value (in dollars per share)	$ 89.15	$ 77.51	$ 72.60
Number of granted awards to be settled in cash (in shares)	48,972	66,252	67,599
Performance Shares
Stocks granted and the weighted average fair value
Units granted (in shares)	142,874	171,708	147,706
Grant date fair value (in dollars per share)	$ 92.16	$ 76.56	$ 78.99