CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common Stock	Net Parent Investment	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2022	$ 455.6	$ 0.0	$ 511.4	$ 0.0	$ 0.0	$ (55.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	52.7		52.7
Other comprehensive loss, net of tax	0.9					0.9
Net transfers to Parent	(36.4)		(36.4)
Ending Balance at Mar. 31, 2023	472.8	0.0	527.7	0.0	0.0	(54.9)
Beginning Balance at Dec. 31, 2023	80.7	0.0	0.0	49.7	87.2	(56.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45.5				45.5
Other comprehensive loss, net of tax	(6.8)					(6.8)
Share-based awards	2.4			2.4
Ending Balance at Mar. 31, 2024	$ 121.8	$ 0.0	$ 0.0	$ 52.1	$ 132.7	$ (63.0)