Capital Stock (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Stock Repurchases Pursuant To Board Of Director Authorizations

The remaining repurchases were made pursuant to the following authorizations (in millions of shares):

	Shares Repurchased			Authorization Remaining at December 31, 2018
Board of Directors’ Authorization	2018	2017	2016
2015 Authorization	—	—	9.0	—
2016 Authorization	9.2	8.7	0.7	1.4
2018 Authorization	—	—	—	15.0
Total	9.2	8.7	9.7	16.4