Capital Stock (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward

The changes in shares of common stock outstanding for the three years ended December 31 are as follows:

(share units in thousands)	2020	2019	2018
Beginning Balance, January 1	180,140	179,724	179,862
Stock incentive plan net activity	986	952	672
Repurchase of common stock	(772)	(536)	(810)
Ending Balance, December 31	180,354	180,140	179,724