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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 30.1	$ (40.2)
Other comprehensive income (loss), net of income taxes:
Change in unfunded pension plan obligation liability	0.0	0.0
Other	0.0	0.1
Comprehensive income (loss)	$ 30.2	$ (40.1)

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