Earnings Per Share And Shareholder's Equity - Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Income (loss) from continuing operations	$ (130.9)	$ (130.9)	$ 44.2
Income (loss) from discontinued operations, net of tax	(9.7)	62.0	(206.8)
Net income (loss)	$ (140.6)	$ (68.9)	$ (162.6)
Denominator:
Weighted average share outstanding for basis EPS (in shares)	134.5	133.6	136.1
Dilutive effect of share-based awards (in shares)	0.0	0.0	1.1
Diluted (in shares)	134.5	133.6	137.2