Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income from continuing operations		$ 26	$ 18	$ 155	$ 74
Weighted-average common shares outstanding		135.8	135.6	135.9	135.4
Effect of dilutive securities:
Weighted-average common shares outstanding-assuming dilution		136.5	136.0	136.5	135.8
Basic earnings per share from continuing operations (in dollars per share)		$ 0.19	$ 0.13	$ 1.14	$ 0.55
Diluted earnings per share from continuing operations (in dollars per share)		$ 0.19	$ 0.13	$ 1.13	$ 0.55
RSUs [Member]
Effect of dilutive securities:
Dilutive securities		0.3	0.2	0.3	0.2
Stock Options [Member]
Effect of dilutive securities:
Dilutive securities	[1]	0.3	0.2	0.3	0.2
Antidilutive securities excluded from computation of diluted earnings per share (in shares)			0.5	0.5	0.4

[1] Options to purchase 0.5 million shares for the three months ended September 30, 2018, and 0.5 million and 0.4 million shares for the nine months ended September 30, 2019 and 2018, respectively, were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive.