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Share repurchases Share Repurchase Table (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	2,731	8,232	7,750	12,284
Treasury Stock, Value, Acquired, Cost Method	$ 336,217	$ 725,439	$ 899,447	$ 1,028,578
Treasury Stock Acquired, Average Cost Per Share	$ 123.14	$ 88.13	$ 116.06	$ 83.73
Open Market Purchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	2,731	250	7,750	4,302
Treasury Stock, Value, Acquired, Cost Method	$ 336,217	$ 21,259	$ 899,447	$ 324,398
Treasury Stock Acquired, Average Cost Per Share	$ 123.14	$ 85.04	$ 116.06	$ 75.40
Tender Offer Member
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock (in shares)	0	7,982	0	7,982
Treasury Stock, Value, Acquired, Cost Method	$ 0	$ 704,180	$ 0	$ 704,180
Treasury Stock Acquired, Average Cost Per Share	$ 0	$ 88.22	$ 0	$ 88.22
Treasury Stock Acquired, Average Cost Per Share, Clearing Price		$ 88.00		$ 88.00
Share Repurchase Fees And Expenses		$ 1,792		$ 1,792

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Share Repurchase Fees And Expenses

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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