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v3.20.2

Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash & cash equivalents | $ 81.4 |  | $ 38.9 |  |  |
Restricted cash | 3.7 |  | 0.8 |  |  |
Accounts receivable - net | 50.6 |  | 70.1 |  |  |
Due from affiliates | 15.0 |  | 30.1 |  |  |
Inventories | 267.5 |  | 320.6 |  |  |
Derivative assets | 10.6 |  | 14.6 |  |  |
Prepaid and other current assets | 14.5 |  | 12.2 |  |  |
Total current assets | 443.3 |  | 487.3 |  |  |
Property, plant and equipment - net | 899.7 |  | 949.2 |  |  |
Investment in subsidiaries | 0.0 |  | 0.0 |  |  |
Due from affiliates - less current portion | 1.3 |  | 0.5 |  |  |
Other assets | 61.1 |  | 62.7 |  |  |
TOTAL | 1,405.4 |  | 1,499.7 |  |  |
Accounts payable, trade | 85.6 |  | 97.1 |  |  |
Due to affiliates | 2.9 |  | 32.9 |  |  |
Accrued and other current liabilities | 69.5 |  | 65.5 |  |  |
Accrued employee benefits costs | 10.4 |  | 10.4 |  |  |
Hawesville term loan | 20.0 |  | 20.0 |  |  |
U.S. revolving credit facility | 5.0 |  | 4.0 |  |  |
Industrial revenue bonds | 7.8 |  | 7.8 |  |  |
Total current liabilities | 201.2 |  | 233.7 |  |  |
Senior notes payable | 242.8 |  | 249.2 |  |  |
Hawesville term loan - less current portion | 5.0 |  | 20.0 |  |  |
Iceland revolving credit facility | 45.0 |  | 0.0 |  |  |
Accrued pension benefits costs - less current portion | 56.0 |  | 60.8 |  |  |
Accrued postretirement benefits costs - less current portion | 98.8 |  | 100.7 |  |  |
Due to affiliates - long term | 0.0 |  | 0.0 |  |  |
Other liabilities | 46.2 |  | 42.4 |  |  |
Leases - right of use liabilities | 23.4 |  | 22.8 |  |  |
Deferred taxes | 94.6 |  | 95.1 |  |  |
Total noncurrent liabilities | 611.8 |  | 591.0 |  |  |
Preferred stock | 0.0 |  | 0.0 |  |  |
Common stock | 1.0 |  | 1.0 |  |  |
Other shareholders' equity | 591.4 |  | 674.0 |  |  |
Total shareholders’ equity | 592.4 | $ 648.7 | 675.0 | $ 689.9 | $ 709.4 | $ 762.2
TOTAL | 1,405.4 |  | 1,499.7 |  |  |
Consolidating Adjustments [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash & 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 | (599.7) |  | (672.2) |  |  |
Due from affiliates - less current portion | (1,355.3) |  | (1,292.0) |  |  |
Other assets | 0.0 |  | 0.0 |  |  |
TOTAL | (1,955.0) |  | (1,964.2) |  |  |
Accounts payable, trade | 0.0 |  | 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 |  |  |
U.S. revolving credit facility | 0.0 |  |  |  |  |
Industrial revenue bonds | 0.0 |  | 0.0 |  |  |
Total current liabilities | 0.0 |  | 0.0 |  |  |
Senior notes payable | 0.0 |  | 0.0 |  |  |
Hawesville term loan - less current portion | 0.0 |  | 0.0 |  |  |
Iceland revolving credit facility | 0.0 |  |  |  |  |
Accrued pension benefits costs - less current portion | 0.0 |  | 0.0 |  |  |
Accrued postretirement benefits costs - less current portion | 0.0 |  | 0.0 |  |  |
Due to affiliates - long term | (1,355.3) |  | (1,292.0) |  |  |
Other liabilities | 0.0 |  | 0.0 |  |  |
Leases - right of use liabilities | 0.0 |  | 0.0 |  |  |
Deferred taxes | 0.0 |  | 0.0 |  |  |
Total noncurrent liabilities | (1,355.3) |  | (1,292.0) |  |  |
Preferred stock | 0.0 |  | 0.0 |  |  |
Common stock | 0.0 |  | (0.1) |  |  |
Other shareholders' equity | (599.7) |  | (672.1) |  |  |
Total shareholders’ equity | (599.7) |  | (672.2) |  |  |
TOTAL | (1,955.0) |  | (1,964.2) |  |  |
The Company [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash & cash equivalents | 3.1 |  | 0.3 |  |  |
Restricted cash | 0.0 |  | 0.0 |  |  |
Accounts receivable - net | 1.7 |  | 0.7 |  |  |
Due from affiliates | 0.0 |  | 0.0 |  |  |
Inventories | 0.0 |  | 0.0 |  |  |
Derivative assets | 9.8 |  | 12.2 |  |  |
Prepaid and other current assets | 4.1 |  | 3.0 |  |  |
Total current assets | 18.7 |  | 16.2 |  |  |
Property, plant and equipment - net | 14.8 |  | 17.2 |  |  |
Investment in subsidiaries | 533.8 |  | 609.5 |  |  |
Due from affiliates - less current portion | 768.7 |  | 749.5 |  |  |
Other assets | 38.0 |  | 38.1 |  |  |
TOTAL | 1,374.0 |  | 1,430.5 |  |  |
Accounts payable, trade | 3.2 |  | 2.3 |  |  |
Due to affiliates | 1.6 |  | 0.0 |  |  |
Accrued and other current liabilities | 23.8 |  | 23.5 |  |  |
Accrued employee benefits costs | 1.9 |  | 1.9 |  |  |
Hawesville term loan | 20.0 |  | 20.0 |  |  |
U.S. revolving credit facility | 5.0 |  |  |  |  |
Industrial revenue bonds | 0.0 |  | 0.0 |  |  |
Total current liabilities | 55.5 |  | 47.7 |  |  |
Senior notes payable | 242.8 |  | 249.2 |  |  |
Hawesville term loan - less current portion | 5.0 |  | 20.0 |  |  |
Iceland revolving credit facility | 0.0 |  |  |  |  |
Accrued pension benefits costs - less current portion | 23.9 |  | 25.1 |  |  |
Accrued postretirement benefits costs - less current portion | 1.0 |  | 1.1 |  |  |
Due to affiliates - long term | 439.8 |  | 403.4 |  |  |
Other liabilities | 7.5 |  | 3.5 |  |  |
Leases - right of use liabilities | 6.1 |  | 5.5 |  |  |
Deferred taxes | 0.0 |  | 0.0 |  |  |
Total noncurrent liabilities | 726.1 |  | 707.8 |  |  |
Preferred stock | 0.0 |  | 0.0 |  |  |
Common stock | 1.0 |  | 1.0 |  |  |
Other shareholders' equity | 591.4 |  | 674.0 |  |  |
Total shareholders’ equity | 592.4 |  | 675.0 |  |  |
TOTAL | 1,374.0 |  | 1,430.5 |  |  |
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash & cash equivalents | 0.2 |  | 0.1 |  |  |
Restricted cash | 1.8 |  | 0.8 |  |  |
Accounts receivable - net | 46.8 |  | 64.1 |  |  |
Due from affiliates | 4.5 |  | 10.9 |  |  |
Inventories | 178.3 |  | 205.5 |  |  |
Derivative assets | 0.0 |  | 0.0 |  |  |
Prepaid and other current assets | 1.9 |  | 2.8 |  |  |
Total current assets | 233.5 |  | 284.2 |  |  |
Property, plant and equipment - net | 319.8 |  | 334.8 |  |  |
Investment in subsidiaries | 65.9 |  | 62.7 |  |  |
Due from affiliates - less current portion | 584.5 |  | 537.9 |  |  |
Other assets | 4.2 |  | 5.7 |  |  |
TOTAL | 1,207.9 |  | 1,225.3 |  |  |
Accounts payable, trade | 59.4 |  | 66.2 |  |  |
Due to affiliates | 1.3 |  | 2.2 |  |  |
Accrued and other current liabilities | 22.3 |  | 27.3 |  |  |
Accrued employee benefits costs | 7.7 |  | 7.7 |  |  |
Hawesville term loan | 0.0 |  | 0.0 |  |  |
U.S. revolving credit facility | 0.0 |  |  |  |  |
Industrial revenue bonds | 7.8 |  | 7.8 |  |  |
Total current liabilities | 98.5 |  | 111.2 |  |  |
Senior notes payable | 0.0 |  | 0.0 |  |  |
Hawesville term loan - less current portion | 0.0 |  | 0.0 |  |  |
Iceland revolving credit facility | 0.0 |  |  |  |  |
Accrued pension benefits costs - less current portion | 25.4 |  | 27.3 |  |  |
Accrued postretirement benefits costs - less current portion | 96.0 |  | 97.8 |  |  |
Due to affiliates - long term | 352.1 |  | 315.9 |  |  |
Other liabilities | 24.4 |  | 22.2 |  |  |
Leases - right of use liabilities | 0.0 |  | 0.4 |  |  |
Deferred taxes | 0.4 |  | 0.4 |  |  |
Total noncurrent liabilities | 498.3 |  | 464.0 |  |  |
Preferred stock | 0.0 |  | 0.0 |  |  |
Common stock | 0.0 |  | 0.0 |  |  |
Other shareholders' equity | 611.1 |  | 650.1 |  |  |
Total shareholders’ equity | 611.1 |  | 650.1 |  |  |
TOTAL | 1,207.9 |  | 1,225.3 |  |  |
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |  |  |  |
Cash & cash equivalents | 78.1 |  | 38.5 |  |  |
Restricted cash | 1.9 |  | 0.0 |  |  |
Accounts receivable - net | 2.1 |  | 5.3 |  |  |
Due from affiliates | 10.5 |  | 19.2 |  |  |
Inventories | 89.2 |  | 115.1 |  |  |
Derivative assets | 0.8 |  | 2.4 |  |  |
Prepaid and other current assets | 8.5 |  | 6.4 |  |  |
Total current assets | 191.1 |  | 186.9 |  |  |
Property, plant and equipment - net | 565.1 |  | 597.2 |  |  |
Investment in subsidiaries | 0.0 |  | 0.0 |  |  |
Due from affiliates - less current portion | 3.4 |  | 5.1 |  |  |
Other assets | 18.9 |  | 18.9 |  |  |
TOTAL | 778.5 |  | 808.1 |  |  |
Accounts payable, trade | 23.0 |  | 28.6 |  |  |
Due to affiliates | 0.0 |  | 30.7 |  |  |
Accrued and other current liabilities | 23.4 |  | 14.7 |  |  |
Accrued employee benefits costs | 0.8 |  | 0.8 |  |  |
Hawesville term loan | 0.0 |  | 0.0 |  |  |
U.S. revolving credit facility | 0.0 |  |  |  |  |
Industrial revenue bonds | 0.0 |  | 0.0 |  |  |
Total current liabilities | 47.2 |  | 74.8 |  |  |
Senior notes payable | 0.0 |  | 0.0 |  |  |
Hawesville term loan - less current portion | 0.0 |  | 0.0 |  |  |
Iceland revolving credit facility | 45.0 |  |  |  |  |
Accrued pension benefits costs - less current portion | 6.7 |  | 8.4 |  |  |
Accrued postretirement benefits costs - less current portion | 1.8 |  | 1.8 |  |  |
Due to affiliates - long term | 563.4 |  | 572.7 |  |  |
Other liabilities | 14.3 |  | 16.7 |  |  |
Leases - right of use liabilities | 17.3 |  | 16.9 |  |  |
Deferred taxes | 94.2 |  | 94.7 |  |  |
Total noncurrent liabilities | 742.7 |  | 711.2 |  |  |
Preferred stock | 0.0 |  | 0.0 |  |  |
Common stock | 0.0 |  | 0.1 |  |  |
Other shareholders' equity | (11.4) |  | 22.0 |  |  |
Total shareholders’ equity | (11.4) |  | 22.1 |  |  |
TOTAL | $ 778.5 |  | $ 808.1 |  |  |

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