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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
2016
Beginning Balance, January 1
179,862

 
179,367

 
178,377

Stock incentive plan net activity
672

 
985

 
1,085

Repurchase of common stock
(810
)
 
(490
)
 
(95
)
Ending Balance, December 31
179,724

 
179,862

 
179,367