UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net loss	$ (162.0)	$ (41.6)
Other comprehensive income:
Defined benefit pension and retiree health benefit plans		0.1
Total other comprehensive income		0.1
Comprehensive loss attributable to stockholders' equity / partners' capital (deficit)	$ (162.0)	$ (41.5)