UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Sales	$ 1,100.4	$ 1,149.4	$ 3,239.9	$ 3,204.5
Cost of sales	1,095.5	887.9	3,092.7	2,774.9
Gross profit	4.9	261.5	147.2	429.6
Operating costs and expenses:
Selling	14.9	12.4	43.7	41.4
General and administrative	40.2	40.2	101.0	103.0
Other operating (income) expense	6.9	(4.1)	17.1	4.1
Operating income (loss)	(57.1)	213.0	(14.6)	281.1
Other income (expense):
Interest expense	(57.7)	(58.7)	(175.3)	(163.7)
Debt extinguishment costs		(0.3)	(0.3)	(5.5)
Gain (loss) on derivative instruments	15.2	(54.3)	9.6	(14.5)
Other income (expense)	(0.3)	0.6	0.7	0.1
Total other expense	(42.8)	(112.7)	(165.3)	(183.6)
Net income (loss) before income taxes	(99.9)	100.3	(179.9)	97.5
Income tax expense	0.7	0.5	1.4	1.4
Net income (loss)	$ (100.6)	$ 99.8	$ (181.3)	$ 96.1
Earnings per share:
Basic	$ (1.18)	$ 1.24	$ (2.21)	$ 1.20
Diluted	$ (1.18)	$ 1.24	$ (2.21)	$ 1.20
Average number of common shares outstanding:
Basic	85,530,080	80,172,810	82,158,405	80,046,930
Diluted	85,530,080	80,387,278	82,158,405	80,148,519