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Subsequent Events (Details) - $ / shares			2 Months Ended	12 Months Ended			14 Months Ended
	Feb. 18, 2022	Jan. 24, 2022	Feb. 23, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 23, 2022
Subsequent events
Cash dividends declared (in dollars per share)				$ 1.92	$ 1.88	$ 1.67
Subsequent event
Subsequent events
Cash dividends declared (in dollars per share)		$ 0.49
Cash dividends paid (in dollars per share)	$ 0.49
Subsequent event | 2021 Stock Repurchase Plan.
Subsequent events
Number of shares repurchased			582,239				2,400,180
Average price per share			$ 85.55				$ 81.73
Additional shares available for repurchase			1.1				1.1

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