Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 4.6	$ 28.9	$ 28.6	$ 43.3
Other comprehensive income (loss), net of benefit (provision) for income taxes of none and $(0.1) million for the three months ended June 30, 2024 and 2023, and net of benefit (provision) for income taxes of none and $(0.2) million for the six months ended June 30, 2024 and 2023
Foreign currency translation adjustments	(0.5)	0.7	(0.5)	0.2
Pension and postretirement liability adjustments	(1.2)	(1.3)	(2.3)	(1.4)
Other comprehensive income (loss), net of tax	(1.7)	(0.6)	(2.8)	(1.2)
Comprehensive Income (Loss), net of tax	$ 2.9	$ 28.3	$ 25.8	$ 42.1