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Equity - Share activity (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (decrease) in common stock, number of shares
Balance at beginning of period (in shares)	66,526	71,996	72,414
Stock options exercised	182	209	443
Purchase/acquisition of treasury stock (in shares)		(5,847)	(1,039)
Balance at end of period (in shares)	66,818	66,526	71,996
Restricted stock units (RSUs)
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	105	100	103
Performance shares and other share-based awards
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	5	68	75
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)	11,285	5,815	5,397
Stock options exercised	(182)	(209)	(443)
Purchase/acquisition of treasury stock (in shares)		5,847	1,039
Balance at end of period (in shares)	10,993	11,285	5,815
Treasury Stock | Restricted stock units (RSUs)
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	(105)	(100)	(103)
Treasury Stock | Performance shares and other share-based awards
Increase (decrease) in common stock, number of shares
Issuance of share-based awards (in shares)	(5)	(68)	(75)

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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