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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