Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Cash and cash equivalents	$ 228.2	$ 105.7
Receivables, net of allowance of $17.1 and $15.9	379.1	363.5
Income tax receivable	2.4	5.2
Raw materials and supplies	320.0	419.4
Work in process	101.5	142.4
Finished goods	54.7	122.5
Inventories:	476.2	684.3
Restricted cash, including partially-owned subsidiaries of $39.1 and $30.6	146.2	129.4
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,920.5 and $1,922.5	9,751.1	9,539.6
Less accumulated depreciation, including partially-owned subsidiaries of $690.0 and $644.7	2,763.0	2,534.8
Property, Plant and Equipment, Net	6,988.1	7,004.8
Goodwill	221.5	221.5
Other assets	390.5	392.1
Total assets	8,832.2	8,906.5
Accounts payable	251.7	305.3
Accrued liabilities	353.0	302.3
Debt, Long-Term and Short-Term, Combined Amount	5,690.9	5,754.2
Deferred income taxes	1,075.6	1,103.5
Other liabilities	153.8	165.7
Total liabilities	7,525.0	7,631.0
Preferred stock – 1.5 shares authorized and unissued	0.0	0.0
Common stock – shares authorized at December 31, 2024 and 2023 – 400.0; shares issued and outstanding at December 31, 2024 – 81.8; at December 31, 2023 – 81.8	0.8	0.8
Capital in excess of par value	8.8	15.4
Retained earnings	1,054.1	1,010.5
Accumulated other comprehensive income (loss)	(4.2)	11.0
Treasury stock – shares at December 31, 2024 – 0.0; at December 31, 2023 – 0.0	0.6	0.6
Stockholders' Equity Attributable to Parent	1,058.9	1,037.1
Noncontrolling interest	248.3	238.4
Total stockholders' equity	1,307.2	1,275.5
Total liabilities and stockholders' equity	8,832.2	8,906.5
Recourse
Debt, Long-Term and Short-Term, Combined Amount	597.8	794.6
Nonrecourse
Debt, Long-Term and Short-Term, Combined Amount	5,093.1	4,959.6
Wholly Owned Subsidiaries [Member] | Nonrecourse
Debt, Long-Term and Short-Term, Combined Amount	4,021.3	3,819.2
Partially-Owned Subsidiaries [Member]
Restricted cash, including partially-owned subsidiaries of $39.1 and $30.6	39.1	30.6
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,920.5 and $1,922.5	1,920.5	1,922.5
Less accumulated depreciation, including partially-owned subsidiaries of $690.0 and $644.7	690.0	644.7
Partially-Owned Subsidiaries [Member] | Nonrecourse
Debt, Long-Term and Short-Term, Combined Amount	$ 1,071.8	$ 1,140.4