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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 81.6 | $ 38.9 |  |
Restricted cash | 2.7 | 0.8 |  |
Accounts receivable - net | 51.0 | 70.1 |  |
Due from affiliates | 10.3 | 30.1 |  |
Inventories | 291.1 | 320.6 |  |
Derivative assets | 6.4 | 14.6 |  |
Prepaid and other current assets | 12.9 | 12.2 |  |
Total current assets | 456.0 | 487.3 |  |
Property, plant and equipment - net | 880.4 | 949.2 |  |
Investment in subsidiaries | 0.0 | 0.0 |  |
Due from affiliates - less current portion | 1.7 | 0.5 |  |
Other assets | 61.5 | 62.7 |  |
TOTAL | 1,399.6 | 1,499.7 | $ 1,537.5 |
LIABILITIES: |  |  |  |
Accounts payable, trade | 106.1 | 97.1 |  |
Interest payable | 15.0 | 0.0 |  |
Due to affiliates | 21.7 | 32.9 |  |
Accrued and other current liabilities | 59.4 | 65.5 |  |
Accrued employee benefits costs | 10.3 | 10.4 |  |
Hawesville term loan | 20.0 | 20.0 |  |
Industrial revenue bonds | 7.8 | 7.8 |  |
Total current liabilities | 240.3 | 233.7 |  |
Senior notes payable | 243.1 | 249.2 |  |
Iceland revolving credit facility | 45.0 | 0.0 |  |
Hawesville term loan - less current portion | 0.0 | 20.0 |  |
Accrued pension benefits costs - less current portion | 65.2 | 60.8 |  |
Accrued postretirement benefits costs - less current portion | 101.5 | 100.7 |  |
Other liabilities | 44.8 | 42.4 |  |
Leases - right of use liabilities | 24.3 | 22.8 |  |
Due to affiliates - less current portion | 0.1 | 0.0 |  |
Deferred taxes | 89.2 | 95.1 |  |
Total noncurrent liabilities | 613.2 | 591.0 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0.0 | 0.0 |  |
Common stock | 1.0 | 1.0 |  |
Other shareholders' equity | 545.1 | 674.0 |  |
Total shareholders’ equity | 546.1 | 675.0 | $ 762.2 | $ 829.6
TOTAL | 1,399.6 | 1,499.7 |  |
Reportable Legal Entities [Member] | The Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 0.8 | 0.3 |  |
Restricted cash | 0.0 | 0.0 |  |
Accounts receivable - net | 1.0 | 0.7 |  |
Due from affiliates | 1.2 | 0.0 |  |
Inventories | 0.0 | 0.0 |  |
Derivative assets | 3.0 | 12.2 |  |
Prepaid and other current assets | 3.5 | 3.0 |  |
Total current assets | 9.5 | 16.2 |  |
Property, plant and equipment - net | 13.8 | 17.2 |  |
Investment in subsidiaries | 495.5 | 609.5 |  |
Due from affiliates - less current portion | 788.8 | 749.5 |  |
Other assets | 34.2 | 38.1 |  |
TOTAL | 1,341.8 | 1,430.5 |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 4.6 | 2.3 |  |
Interest payable | 15.0 |  |  |
Due to affiliates | 0.0 | 0.0 |  |
Accrued and other current liabilities | 17.7 | 23.5 |  |
Accrued employee benefits costs | 1.9 | 1.9 |  |
Hawesville term loan | 20.0 | 20.0 |  |
Industrial revenue bonds | 0.0 | 0.0 |  |
Total current liabilities | 59.2 | 47.7 |  |
Senior notes payable | 243.1 | 249.2 |  |
Iceland revolving credit facility | 0.0 |  |  |
Hawesville term loan - less current portion |  | 20.0 |  |
Accrued pension benefits costs - less current portion | 26.3 | 25.1 |  |
Accrued postretirement benefits costs - less current portion | 1.0 | 1.1 |  |
Other liabilities | 6.1 | 3.5 |  |
Leases - right of use liabilities | 6.4 | 5.5 |  |
Due to affiliates - less current portion | 453.6 | 403.4 |  |
Deferred taxes | 0.0 | 0.0 |  |
Total noncurrent liabilities | 736.5 | 707.8 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0.0 | 0.0 |  |
Common stock | 1.0 | 1.0 |  |
Other shareholders' equity | 545.1 | 674.0 |  |
Total shareholders’ equity | 546.1 | 675.0 |  |
TOTAL | 1,341.8 | 1,430.5 |  |
Reportable Legal Entities [Member] | Combined Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 1.2 | 0.1 |  |
Restricted cash | 0.8 | 0.8 |  |
Accounts receivable - net | 47.8 | 64.1 |  |
Due from affiliates | 9.1 | 10.9 |  |
Inventories | 183.8 | 205.5 |  |
Derivative assets | 0.0 | 0.0 |  |
Prepaid and other current assets | 0.2 | 2.8 |  |
Total current assets | 242.9 | 284.2 |  |
Property, plant and equipment - net | 311.4 | 334.8 |  |
Investment in subsidiaries | 65.4 | 62.7 |  |
Due from affiliates - less current portion | 600.3 | 537.9 |  |
Other assets | 4.3 | 5.7 |  |
TOTAL | 1,224.3 | 1,225.3 |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 60.3 | 66.2 |  |
Interest payable | 0.0 |  |  |
Due to affiliates | 10.4 | 2.2 |  |
Accrued and other current liabilities | 23.7 | 27.3 |  |
Accrued employee benefits costs | 7.8 | 7.7 |  |
Hawesville term loan | 0.0 | 0.0 |  |
Industrial revenue bonds | 7.8 | 7.8 |  |
Total current liabilities | 110.0 | 111.2 |  |
Senior notes payable | 0.0 | 0.0 |  |
Iceland revolving credit facility | 0.0 |  |  |
Hawesville term loan - less current portion |  | 0.0 |  |
Accrued pension benefits costs - less current portion | 29.9 | 27.3 |  |
Accrued postretirement benefits costs - less current portion | 98.5 | 97.8 |  |
Other liabilities | 24.9 | 22.2 |  |
Leases - right of use liabilities | 0.0 | 0.4 |  |
Due to affiliates - less current portion | 374.1 | 315.9 |  |
Deferred taxes | 0.4 | 0.4 |  |
Total noncurrent liabilities | 527.8 | 464.0 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0.0 | 0.0 |  |
Common stock | 0.0 | 0.0 |  |
Other shareholders' equity | 586.5 | 650.1 |  |
Total shareholders’ equity | 586.5 | 650.1 |  |
TOTAL | 1,224.3 | 1,225.3 |  |
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 79.6 | 38.5 |  |
Restricted cash | 1.9 | 0.0 |  |
Accounts receivable - net | 2.2 | 5.3 |  |
Due from affiliates | 0.0 | 19.2 |  |
Inventories | 107.3 | 115.1 |  |
Derivative assets | 3.4 | 2.4 |  |
Prepaid and other current assets | 9.2 | 6.4 |  |
Total current assets | 203.6 | 186.9 |  |
Property, plant and equipment - net | 555.2 | 597.2 |  |
Investment in subsidiaries | 0.0 | 0.0 |  |
Due from affiliates - less current portion | 3.9 | 5.1 |  |
Other assets | 23.0 | 18.9 |  |
TOTAL | 785.7 | 808.1 |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 41.2 | 28.6 |  |
Interest payable | 0.0 |  |  |
Due to affiliates | 11.3 | 30.7 |  |
Accrued and other current liabilities | 18.0 | 14.7 |  |
Accrued employee benefits costs | 0.6 | 0.8 |  |
Hawesville term loan | 0.0 | 0.0 |  |
Industrial revenue bonds | 0.0 | 0.0 |  |
Total current liabilities | 71.1 | 74.8 |  |
Senior notes payable | 0.0 | 0.0 |  |
Iceland revolving credit facility | 45.0 |  |  |
Hawesville term loan - less current portion |  | 0.0 |  |
Accrued pension benefits costs - less current portion | 9.0 | 8.4 |  |
Accrued postretirement benefits costs - less current portion | 2.0 | 1.8 |  |
Other liabilities | 13.8 | 16.7 |  |
Leases - right of use liabilities | 17.9 | 16.9 |  |
Due to affiliates - less current portion | 563.7 | 572.7 |  |
Deferred taxes | 88.8 | 94.7 |  |
Total noncurrent liabilities | 740.2 | 711.2 |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0.0 | 0.0 |  |
Common stock | 0.1 | 0.1 |  |
Other shareholders' equity | (25.7) | 22.0 |  |
Total shareholders’ equity | (25.6) | 22.1 |  |
TOTAL | 785.7 | 808.1 |  |
Consolidating Adjustments [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 |  |
Restricted cash | 0.0 | 0.0 |  |
Accounts receivable - net | 0.0 | 0.0 |  |
Due from affiliates | 0.0 | 0.0 |  |
Inventories | 0.0 | 0.0 |  |
Derivative assets | 0.0 | 0.0 |  |
Prepaid and other current assets | 0.0 | 0.0 |  |
Total current assets | 0.0 | 0.0 |  |
Property, plant and equipment - net | 0.0 | 0.0 |  |
Investment in subsidiaries | (560.9) | (672.2) |  |
Due from affiliates - less current portion | (1,391.3) | (1,292.0) |  |
Other assets | 0.0 | 0.0 |  |
TOTAL | (1,952.2) | (1,964.2) |  |
LIABILITIES: |  |  |  |
Accounts payable, trade | 0.0 | 0.0 |  |
Interest payable | 0.0 |  |  |
Due to affiliates | 0.0 | 0.0 |  |
Accrued and other current liabilities | 0.0 | 0.0 |  |
Accrued employee benefits costs | 0.0 | 0.0 |  |
Hawesville term loan | 0.0 | 0.0 |  |
Industrial revenue bonds | 0.0 | 0.0 |  |
Total current liabilities | 0.0 | 0.0 |  |
Senior notes payable | 0.0 | 0.0 |  |
Iceland revolving credit facility | 0.0 |  |  |
Hawesville term loan - less current portion |  | 0.0 |  |
Accrued pension benefits costs - less current portion | 0.0 | 0.0 |  |
Accrued postretirement benefits costs - less current portion | 0.0 | 0.0 |  |
Other liabilities | 0.0 | 0.0 |  |
Leases - right of use liabilities | 0.0 | 0.0 |  |
Due to affiliates - less current portion | (1,391.3) | (1,292.0) |  |
Deferred taxes | 0.0 | 0.0 |  |
Total noncurrent liabilities | (1,391.3) | (1,292.0) |  |
SHAREHOLDERS’ EQUITY: |  |  |  |
Preferred stock | 0.0 | 0.0 |  |
Common stock | (0.1) | (0.1) |  |
Other shareholders' equity | (560.8) | (672.1) |  |
Total shareholders’ equity | (560.9) | (672.2) |  |
TOTAL | $ (1,952.2) | $ (1,964.2) |  |

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