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Condensed consolidating financial information - Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]    
Cash & cash equivalents $ 130.8 $ 167.2
Restricted cash 0.8 0.8
Accounts receivable - net 83.4 43.1
Due from affiliates 8.7 10.4
Inventories 330.7 317.5
Prepaid and other current assets 14.2 14.7
Total current assets 568.6 553.7
Property, plant and equipment - net 955.1 971.9
Investment in subsidiaries 0.0 0.0
Due from affiliates - long term 0.0 0.0
Other assets 57.1 56.0
TOTAL 1,580.8 1,581.6
Accounts payable, trade 95.8 89.9
Due to affiliates 14.6 20.4
Accrued and other current liabilities 68.0 61.4
Accrued employee benefits costs 11.0 11.0
Industrial revenue bonds 7.8 7.8
Total current liabilities 197.2 190.5
Senior notes payable 248.3 248.2
Accrued pension benefits costs - less current portion 37.4 38.9
Accrued postretirement benefits costs - less current portion 112.5 113.0
Due to affiliates - long term 0.0  
Other liabilities 54.5 57.9
Intercompany loan   0.0
Deferred taxes 100.5 103.5
Total noncurrent liabilities 553.2 561.5
Preferred stock 0.0 0.0
Common stock 0.9 0.9
Other shareholders' equity 829.5 828.7
Total shareholders’ equity 830.4 829.6
TOTAL 1,580.8 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 (811.8) (805.8)
Due from affiliates - long term (895.1) (872.3)
Other assets (32.2) (32.0)
TOTAL (1,739.1) (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 (32.2) (32.0)
Accrued postretirement benefits costs - less current portion 0.0 0.0
Due to affiliates - long term (895.1)  
Other liabilities 0.0 0.0
Intercompany loan   (872.3)
Deferred taxes 0.0 0.0
Total noncurrent liabilities (927.3) (904.3)
Preferred stock 0.0 0.0
Common stock (0.1) (0.1)
Other shareholders' equity (811.7) (805.7)
Total shareholders’ equity (811.8) (805.8)
TOTAL (1,739.1) (1,710.1)
The Company [Member] | Reportable Legal Entities [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Cash & cash equivalents 8.5 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 3.4 3.3
Total current assets 12.1 67.9
Property, plant and equipment - net 20.6 19.4
Investment in subsidiaries 758.2 751.8
Due from affiliates - long term 546.1 513.3
Other assets 28.3 28.0
TOTAL 1,365.3 1,380.4
Accounts payable, trade 1.8 6.3
Due to affiliates 0.7 0.4
Accrued and other current liabilities 20.2 16.0
Accrued employee benefits costs 1.9 1.9
Industrial revenue bonds 0.0 0.0
Total current liabilities 24.6 24.6
Senior notes payable 248.3 248.2
Accrued pension benefits costs - less current portion 39.2 39.5
Accrued postretirement benefits costs - less current portion 0.8 0.9
Due to affiliates - long term 218.0  
Other liabilities 4.0 3.5
Intercompany loan   234.1
Deferred taxes 0.0 0.0
Total noncurrent liabilities 510.3 526.2
Preferred stock 0.0 0.0
Common stock 0.9 0.9
Other shareholders' equity 829.5 828.7
Total shareholders’ equity 830.4 829.6
TOTAL 1,365.3 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 83.2 42.8
Due from affiliates 7.9 10.3
Inventories 216.8 205.1
Prepaid and other current assets 0.5 0.8
Total current assets 309.1 259.7
Property, plant and equipment - net 286.9 295.8
Investment in subsidiaries 53.6 54.0
Due from affiliates - long term 339.6 349.6
Other assets 34.3 34.1
TOTAL 1,023.5 993.2
Accounts payable, trade 55.3 51.4
Due to affiliates (0.5) 2.6
Accrued and other current liabilities 16.6 19.3
Accrued employee benefits costs 8.3 8.3
Industrial revenue bonds 7.8 7.8
Total current liabilities 87.5 89.4
Senior notes payable 0.0 0.0
Accrued pension benefits costs - less current portion 17.9 18.3
Accrued postretirement benefits costs - less current portion 110.0 110.4
Due to affiliates - long term 81.1  
Other liabilities 28.1 32.0
Intercompany loan   53.8
Deferred taxes 1.7 1.7
Total noncurrent liabilities 238.8 216.2
Preferred stock 0.0 0.0
Common stock 0.0 0.0
Other shareholders' equity 697.2 687.6
Total shareholders’ equity 697.2 687.6
TOTAL 1,023.5 993.2
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Cash & cash equivalents 122.4 103.0
Restricted cash 0.0 0.0
Accounts receivable - net 0.2 0.3
Due from affiliates 0.8 0.0
Inventories 113.7 112.2
Prepaid and other current assets 10.3 10.6
Total current assets 247.4 226.1
Property, plant and equipment - net 647.6 656.7
Investment in subsidiaries 0.0 0.0
Due from affiliates - long term 9.4 9.4
Other assets 26.7 25.9
TOTAL 931.1 918.1
Accounts payable, trade 38.7 32.2
Due to affiliates 14.4 17.4
Accrued and other current liabilities 31.2 26.1
Accrued employee benefits costs 0.8 0.8
Industrial revenue bonds 0.0 0.0
Total current liabilities 85.1 76.5
Senior notes payable 0.0 0.0
Accrued pension benefits costs - less current portion 12.5 13.1
Accrued postretirement benefits costs - less current portion 1.7 1.7
Due to affiliates - long term 596.0  
Other liabilities 22.4 22.4
Intercompany loan   584.4
Deferred taxes 98.8 101.8
Total noncurrent liabilities 731.4 723.4
Preferred stock 0.0 0.0
Common stock 0.1 0.1
Other shareholders' equity 114.5 118.1
Total shareholders’ equity 114.6 118.2
TOTAL $ 931.1 $ 918.1