Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income from continuing operations		$ 1	$ 53
Weighted-average common shares outstanding		134.9	135.8
Effect of dilutive securities:
Weighted-average common shares outstanding-assuming dilution		135.1	136.2
Basic earnings per share from continuing operations (in dollars per share)		$ 0.01	$ 0.39
Diluted earnings per share from continuing operations (in dollars per share)		$ 0.01	$ 0.39
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		1.2	0.7
RSU
Effect of dilutive securities:
Dilutive securities		0.1	0.2
Options
Effect of dilutive securities:
Dilutive securities	[1]	0.1	0.2

[1] Options to purchase 1.2 million and 0.7 million shares for the three months ended March 31, 2020 and 2019, respectively, were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive.