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	Treasury Stock
Balance at beginning of period at Dec. 31, 2021	$ 427.6	$ 0.0	$ 469.2	$ 0.0	$ 0.0	$ (41.6)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	170.4		170.4
Other comprehensive income(loss), net of tax	(14.2)					(14.2)
Net transfers (to) from Parent	(128.2)		(128.2)
Ending Balance at Dec. 31, 2022	455.6	0.0	511.4	0.0	0.0	(55.8)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	171.3		84.1		87.2
Other comprehensive income(loss), net of tax	(0.4)					(0.4)
Share-based awards	4.3			4.3
Net transfers (to) from Parent	(550.1)		(595.5)	45.4
Ending Balance at Dec. 31, 2023	80.7	0.0	0.0	49.7	87.2	(56.2)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	185.6				185.6
Other comprehensive income(loss), net of tax	(22.8)					(22.8)
Share-based awards	12.2			12.2
Common stock repurchased	(20.0)						(20.0)
Cash dividends declared	(8.3)				(8.3)
Ending Balance at Dec. 31, 2024	$ 227.4	$ 0.0	$ 0.0	$ 61.9	$ 264.5	$ (79.0)	$ (20.0)