Earnings Per Share And Shareholder's Equity - Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Income (loss) from continuing operations	$ (4.4)	$ (130.9)	$ (130.9)
Income (loss) from discontinued operations, net of tax	(8.3)	(9.7)	62.0
Net Income (Loss)	$ (12.7)	$ (140.6)	$ (68.9)
Denominator:
Weighted average share outstanding for basis EPS (in shares)	135.3	134.5	133.6
Dilutive effect of share-based awards (in shares)	0.0	0.0	0.0
Diluted (in shares)	135.3	134.5	133.6