Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
(Loss) income from continuing operations		$ (21)	$ 8	$ 20	$ 103
Weighted-average common shares outstanding		132.0	135.8	132.9	135.9
Effect of dilutive securities:
Weighted-average common shares outstanding-assuming dilution		132.0	136.5	133.1	136.5
Basic (loss) earnings per share from continuing operations (in dollars per share)		$ (0.17)	$ 0.06	$ 0.14	$ 0.76
Diluted (loss) earnings per share from continuing operations (in dollars per share)		$ (0.17)	$ 0.06	$ 0.14	$ 0.75
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		1.4		1.4	0.5
RSUs [Member]
Effect of dilutive securities:
Dilutive securities	[1]		0.3	0.1	0.3
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		0.2
Stock Options [Member]
Effect of dilutive securities:
Dilutive securities	[1],[2]		0.3		0.3
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		0.1

[1] Securities are not included in the table in periods when antidilutive. For the three months ended September 30, 2020, weighted average potentially dilutive shares from RSUs of 0.2 million and weighted average potentially dilutive shares from stock options of 0.1 million were excluded from the dilutive (loss) earnings per share calculation due to the antidilutive effect such shares would have had on net loss per common share.

[2] Options to purchase 1.4 million shares for the three months ended September 30, 2020, and 1.4 million and 0.5 million shares for the nine months ended September 30, 2020, and 2019, respectively, were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive. There were an insignificant amount of options that would have been anti-dilutive in the three months ended September 30, 2019.