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Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (190.6)	$ (760.5)	$ (211.6)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net	0.5	0.9	1.0
Unrealized gains on hedging activities	0.0	2.7	10.8
Reclassification adjustment for gains on hedging activities	0.0	(8.9)	(0.1)
Reclassification adjustment for (gains) losses on pension benefit obligation	0.0	(3.5)	7.5
Total other comprehensive income (loss), net of tax	0.5	(8.8)	19.2
Comprehensive loss, net of tax	$ (190.1)	$ (769.3)	$ (192.4)

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