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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 8.5	$ 36.9	$ (16.2)	$ 105.4
Other comprehensive income (loss), net of income taxes:
Change in unfunded pension plan obligation liability	0.0	0.1	0.0	0.3
Other	0.0	0.0	0.1	0.1
Comprehensive income (loss)	$ 8.5	$ 37.0	$ (16.1)	$ 105.7

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