CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (73.6)	$ 8.1	$ (75.0)	$ 15.9
Foreign currency translation adjustment	33.6	(5.7)	51.2	(14.9)
Pension and other postretirement benefits:
Amortization of loss, net of tax (Note 2)	0.1	0.1	0.2	0.2
Other comprehensive income (loss)	33.7	(5.6)	51.4	(14.7)
Comprehensive income (loss)	$ (39.9)	$ 2.5	$ (23.6)	$ 1.2