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Condensed consolidating financial information - Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Cash & cash equivalents | $ 124.0 | $ 167.2
Restricted cash | 0.8 | 0.8
Accounts receivable - net | 96.6 | 43.1
Due from affiliates | 6.6 | 10.4
Inventories | 363.0 | 317.5
Prepaid and other current assets | 15.9 | 14.7
Total current assets | 606.9 | 553.7
Property, plant and equipment - net | 947.9 | 971.9
Investment in subsidiaries | 0.0 | 0.0
Due from affiliates - long term | 0.0 | 0.0
Other assets | 62.1 | 56.0
TOTAL | 1,616.9 | 1,581.6
Accounts payable, trade | 124.0 | 89.9
Due to affiliates | 2.6 | 20.4
Accrued and other current liabilities | 64.4 | 61.4
Accrued employee benefits costs | 11.0 | 11.0
Industrial revenue bonds | 7.8 | 7.8
Total current liabilities | 209.8 | 190.5
Senior notes payable | 248.4 | 248.2
Accrued pension benefits costs - less current portion | 35.7 | 38.9
Accrued postretirement benefits costs - less current portion | 110.0 | 113.0
Due to affiliates - long term | 0.0 |
Other liabilities | 57.6 | 57.9
Intercompany loan |  | 0.0
Deferred taxes | 102.3 | 103.5
Total noncurrent liabilities | 554.0 | 561.5
Preferred stock | 0.0 | 0.0
Common stock | 0.9 | 0.9
Other shareholders' equity | 852.2 | 828.7
Total shareholders’ equity | 853.1 | 829.6
TOTAL | 1,616.9 | 1,581.6
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
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 | (838.9) | (805.8)
Due from affiliates - long term | (857.2) | (872.3)
Other assets | (32.4) | (32.0)
TOTAL | (1,728.5) | (1,710.1)
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
Industrial revenue bonds | 0.0 | 0.0
Total current liabilities | 0.0 | 0.0
Senior notes payable | 0.0 | 0.0
Accrued pension benefits costs - less current portion | (32.4) | (32.0)
Accrued postretirement benefits costs - less current portion | 0.0 | 0.0
Due to affiliates - long term | (857.2) |
Other liabilities | 0.0 | 0.0
Intercompany loan |  | (872.3)
Deferred taxes | 0.0 | 0.0
Total noncurrent liabilities | (889.6) | (904.3)
Preferred stock | 0.0 | 0.0
Common stock | (0.1) | (0.1)
Other shareholders' equity | (838.8) | (805.7)
Total shareholders’ equity | (838.9) | (805.8)
TOTAL | (1,728.5) | (1,710.1)
The Company [Member] | Reportable Legal Entities [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Cash & cash equivalents | 27.3 | 64.3
Restricted cash | 0.0 | 0.0
Accounts receivable - net | 0.0 | 0.0
Due from affiliates | 0.0 | 0.1
Inventories | 0.2 | 0.2
Prepaid and other current assets | 3.0 | 3.3
Total current assets | 30.5 | 67.9
Property, plant and equipment - net | 21.6 | 19.4
Investment in subsidiaries | 788.0 | 751.8
Due from affiliates - long term | 513.9 | 513.3
Other assets | 28.7 | 28.0
TOTAL | 1,382.7 | 1,380.4
Accounts payable, trade | 2.0 | 6.3
Due to affiliates | 0.8 | 0.4
Accrued and other current liabilities | 15.9 | 16.0
Accrued employee benefits costs | 1.9 | 1.9
Industrial revenue bonds | 0.0 | 0.0
Total current liabilities | 20.6 | 24.6
Senior notes payable | 248.4 | 248.2
Accrued pension benefits costs - less current portion | 38.6 | 39.5
Accrued postretirement benefits costs - less current portion | 0.8 | 0.9
Due to affiliates - long term | 216.3 |
Other liabilities | 5.2 | 3.5
Intercompany loan |  | 234.1
Deferred taxes | (0.3) | 0.0
Total noncurrent liabilities | 509.0 | 526.2
Preferred stock | 0.0 | 0.0
Common stock | 0.9 | 0.9
Other shareholders' equity | 852.2 | 828.7
Total shareholders’ equity | 853.1 | 829.6
TOTAL | 1,382.7 | 1,380.4
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Cash & cash equivalents | (0.1) | (0.1)
Restricted cash | 0.8 | 0.8
Accounts receivable - net | 96.3 | 42.8
Due from affiliates | 6.6 | 10.3
Inventories | 223.5 | 205.1
Prepaid and other current assets | 0.5 | 0.8
Total current assets | 327.6 | 259.7
Property, plant and equipment - net | 288.0 | 295.8
Investment in subsidiaries | 50.9 | 54.0
Due from affiliates - long term | 333.4 | 349.6
Other assets | 34.6 | 34.1
TOTAL | 1,034.5 | 993.2
Accounts payable, trade | 70.3 | 51.4
Due to affiliates | 0.0 | 2.6
Accrued and other current liabilities | 19.2 | 19.3
Accrued employee benefits costs | 8.3 | 8.3
Industrial revenue bonds | 7.8 | 7.8
Total current liabilities | 105.6 | 89.4
Senior notes payable | 0.0 | 0.0
Accrued pension benefits costs - less current portion | 17.6 | 18.3
Accrued postretirement benefits costs - less current portion | 107.6 | 110.4
Due to affiliates - long term | 52.0 |
Other liabilities | 29.6 | 32.0
Intercompany loan |  | 53.8
Deferred taxes | 1.8 | 1.7
Total noncurrent liabilities | 208.6 | 216.2
Preferred stock | 0.0 | 0.0
Common stock | 0.0 | 0.0
Other shareholders' equity | 720.3 | 687.6
Total shareholders’ equity | 720.3 | 687.6
TOTAL | 1,034.5 | 993.2
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Cash & cash equivalents | 96.8 | 103.0
Restricted cash | 0.0 | 0.0
Accounts receivable - net | 0.3 | 0.3
Due from affiliates | 0.0 | 0.0
Inventories | 139.3 | 112.2
Prepaid and other current assets | 12.4 | 10.6
Total current assets | 248.8 | 226.1
Property, plant and equipment - net | 638.3 | 656.7
Investment in subsidiaries | 0.0 | 0.0
Due from affiliates - long term | 9.9 | 9.4
Other assets | 31.2 | 25.9
TOTAL | 928.2 | 918.1
Accounts payable, trade | 51.7 | 32.2
Due to affiliates | 1.8 | 17.4
Accrued and other current liabilities | 29.3 | 26.1
Accrued employee benefits costs | 0.8 | 0.8
Industrial revenue bonds | 0.0 | 0.0
Total current liabilities | 83.6 | 76.5
Senior notes payable | 0.0 | 0.0
Accrued pension benefits costs - less current portion | 11.9 | 13.1
Accrued postretirement benefits costs - less current portion | 1.6 | 1.7
Due to affiliates - long term | 588.9 |
Other liabilities | 22.8 | 22.4
Intercompany loan |  | 584.4
Deferred taxes | 100.8 | 101.8
Total noncurrent liabilities | 726.0 | 723.4
Preferred stock | 0.0 | 0.0
Common stock | 0.1 | 0.1
Other shareholders' equity | 118.5 | 118.1
Total shareholders’ equity | 118.6 | 118.2
TOTAL | $ 928.2 | $ 918.1

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- Definition Carrying value as of the balance sheet date of the long-term debt associated with industrial revenue bonds. For classified balance sheets, these bonds are considered current assets because they are remarketed weekly and the bonds could be required to be repaid upon demand if there is a failed remarketing. + References No definition available. + Details
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