UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net loss	$ (147.9)	$ (39.1)	$ (309.9)	$ (80.7)
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)	$ (147.9)	$ (39.1)	$ (309.9)	$ (80.6)