Consolidated Balance Sheets - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 178.1	$ 132.0
Receivables, net of allowance	197.3	199.0
Income tax receivable	440.5	445.8
Inventories:
Raw materials and supplies	174.3	176.4
Work in process	59.5	52.2
Finished goods	87.1	92.6
Inventory, Net	320.9	321.2
Restricted cash, including partially-owned subsidiaries of $32.9 and $31.1	107.4	96.4
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,931.1 and $1,931.6	9,259.8	9,193.0
Less accumulated depreciation, including partially-owned subsidiaries of $537.6 and $525.7	2,233.0	2,189.6
Property, Plant and Equipment, Net	7,026.8	7,003.4
Goodwill	215.7	208.8
Other assets	288.8	295.2
Total assets	8,775.5	8,701.8
Liabilities and Equity [Abstract]
Accounts payable	159.2	156.4
Accrued liabilities	276.3	314.7
Debt:
Recourse	398.2	448.2
Non-Recourse Debt	4,766.9	4,568.8
Total debt	5,165.1	5,017.0
Deferred income taxes	1,051.5	1,047.5
Other liabilities	155.5	150.2
Total liabilities	$ 6,807.6	$ 6,685.8
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred Stock, Shares Authorized	1.5	1.5
Preferred Stock, Shares Subscribed but Unissued	1.5	1.5
Preferred stock – 1.5 shares authorized and unissued	$ 0.0	$ 0.0
Common Stock, Shares Authorized	400.0	400.0
Common stock – 400.0 shares authorized	$ 1.1	$ 1.1
Capital in excess of par value	6.1	0.0
Retained earnings	1,749.4	1,769.4
Accumulated other comprehensive loss	(25.8)	(30.9)
Treasury stock	(38.4)	(0.8)
Total Equity	1,692.4	1,738.8
Noncontrolling interest	275.5	277.2
Total stockholders' equity	1,967.9	2,016.0
Total liabilities and stockholders' equity	8,775.5	8,701.8
Partially-owned subsidiaries
Inventories:
Property, plant, and equipment, at cost, including partially-owned subsidiaries of $1,931.1 and $1,931.6	1,931.1	1,931.6
Less accumulated depreciation, including partially-owned subsidiaries of $537.6 and $525.7	537.6	525.7
Debt:
Non-Recourse Debt	1,216.4	1,228.3
Wholly-owned subsidiaries
Debt:
Non-Recourse Debt	$ 3,550.5	$ 3,340.5