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Stock-Based Compensation Plans - Stock Options Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-Based Compensation Plans
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Shares
Exercised (in shares)	(2,759)
Stock Options
Stock-Based Compensation Plans
Stock options awarded, term	10 years
Performance Options
Shares
Granted (in shares)	4,847
2009 Plan
Stock-Based Compensation Plans
Common stock, par value (in dollars per share)	$ 0.01
Common stock shares available for grant	6,088,456
2009 Plan | Stock Options
Shares
Options outstanding at the beginning of the period (in shares)	12,506	14,408	124,212
Exercised (in shares)	(2,759)	(1,902)	(109,804)
Granted (in shares)	294,115	0	0
Forfeited (in shares)	(4,713)	0	0
Options outstanding at the end of the period (in shares)	299,149	12,506	14,408
Options exercisable at the end of the period (in shares)	9,747	12,506	14,408
Weighted average exercise price per share
Options outstanding at the beginning of the period (in dollars per share)	$ 129.35	$ 124.05	$ 128.84
Exercised (in dollars per share)	124.34	89.17	129.47
Granted (in dollars per share)	180.32	0	0
Forfeited (in dollars per share)	180.32	0	0
Options outstanding at the end of the period (in dollars per share)	178.71	129.35	124.05
Options exercisable at the end of the period (in dollars per share)	$ 130.77	$ 129.35	$ 124.05

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Face amount or stated value per share of common stock.

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Gross number of share options (or share units) granted during the period.

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