Unrestricted Subsidiaries - Schedule of Financial Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments
Cash and cash equivalents	$ 34.6		$ 7.9	$ 13.7
Accounts receivable - trade	279.6		252.4
Accounts receivable - other	26.0		33.8
Inventory	409.5		439.4
Prepaid expenses and other current assets	40.1		51.6
Property, plant and equipment, net	1,453.3		1,506.3	1,526.9
Other noncurrent assets, net	397.0		450.3
Accounts payable	321.6		322.0
Accrued interest payable	42.7		48.7
Obligations under inventory financing agreements	44.8		190.4
Other current liabilities	85.4		131.5
Current portion of long-term debt	400.3		55.7
Other long-term liabilities	153.3		53.6
Long-term debt, less current portion	1,659.0		1,829.7
Redeemable noncontrolling interest	245.6		245.6
Stockholders' equity	(672.2)	$ (566.4)	(490.3)	$ (443.2)	$ (543.4)	$ (533.3)
Eliminations
Schedule of Equity Method Investments
Cash and cash equivalents	0.0		0.0
Accounts receivable - trade	0.0		0.0
Accounts receivable - other	0.0		0.0
Inventory	0.0		0.0
Prepaid expenses and other current assets	0.0		0.0
Property, plant and equipment, net	0.0		0.0
Other noncurrent assets, net	0.0		0.0
Accounts payable	(408.8)		(293.7)
Accrued interest payable	0.0		0.0
Obligations under inventory financing agreements	0.0		0.0
Other current liabilities	0.0		0.0
Current portion of long-term debt	0.0		0.0
Other long-term liabilities	0.0		0.0
Long-term debt, less current portion	(98.3)		(100.0)
Redeemable noncontrolling interest	0.0		0.0
Stockholders' equity	(18.8)		(18.8)
Parent Company and Restricted Subsidiaries
Schedule of Equity Method Investments
Cash and cash equivalents	30.9		7.3
Accounts receivable - trade	256.2		230.7
Accounts receivable - other	18.6		24.8
Inventory	354.7		353.1
Prepaid expenses and other current assets	20.3		14.6
Property, plant and equipment, net	705.4		731.7
Other noncurrent assets, net	384.4		436.9
Accounts payable	278.7		282.4
Accrued interest payable	41.6		47.8
Obligations under inventory financing agreements	0.0		126.0
Other current liabilities	75.2		104.5
Current portion of long-term debt	381.4		38.8
Other long-term liabilities	152.0		50.6
Long-term debt, less current portion	1,236.6		1,381.0
Redeemable noncontrolling interest	0.0		0.0
Stockholders' equity	(228.7)		(174.3)
Unrestricted Subsidiaries
Schedule of Equity Method Investments
Cash and cash equivalents	3.7		0.6
Accounts receivable - trade	23.4		21.7
Accounts receivable - other	7.4		9.0
Inventory	54.8		86.3
Prepaid expenses and other current assets	19.8		37.0
Property, plant and equipment, net	747.9		774.6
Other noncurrent assets, net	12.6		13.4
Accounts payable	451.7		333.3
Accrued interest payable	1.1		0.9
Obligations under inventory financing agreements	44.8		64.4
Other current liabilities	10.2		27.0
Current portion of long-term debt	18.9		16.9
Other long-term liabilities	1.3		3.0
Long-term debt, less current portion	520.7		548.7
Redeemable noncontrolling interest	245.6		245.6
Stockholders' equity	$ (424.7)		$ (297.2)