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Equity - Share activity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	67,016	66,818	66,526
Stock options exercised	331	124	182
Purchase/acquisition of treasury stock (in shares)	(765)
Balance at end of period (in shares)	66,657	67,016	66,818
RSU | Employee
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	69	69	105
Performance shares and other share-based awards
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	6	5	5
Common Stock
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	77,811	77,811	77,811
Balance at end of period (in shares)	77,811	77,811	77,811
Treasury Stock
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	10,795	10,993	11,285
Stock options exercised	(331)	(124)	(182)
Purchase/acquisition of treasury stock (in shares)	765
Balance at end of period (in shares)	11,154	10,795	10,993
Treasury Stock | RSU | Employee
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	(69)	(69)	(105)
Treasury Stock | Performance shares and other share-based awards
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	(6)	(5)	(5)

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