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Condensed Consolidating Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]            
Cash & cash equivalents $ 22.5   $ 38.9      
Restricted cash 0.8   0.8      
Accounts receivable - net 81.9   82.5      
Due from affiliates 23.3   22.7      
Inventories 322.3   343.8      
Prepaid and other current assets 23.3   18.0      
Total current assets 474.1   506.7      
Property, plant and equipment - net 950.1   967.3      
Investment in subsidiaries 0.0   0.0      
Leases - right of use assets 24.2          
Due from affiliates - long term 1.4   0.0      
Other assets 42.0   63.5      
TOTAL 1,491.8   1,537.5      
Accounts payable, trade 112.0   119.4      
Due to affiliates 0.0   10.3      
Accrued and other current liabilities 66.1   52.5      
Accrued employee benefits costs 11.0   11.0      
Term loan - current 15.0   0.0      
Revolving credit facility 0.4   23.3      
Industrial revenue bonds 7.8   7.8      
Total current liabilities 212.3   224.3      
Senior notes payable 249.0   248.6      
Term loan - less current portion 25.0   0.0      
Accrued pension benefits costs - less current portion 48.4   50.9      
Accrued postretirement benefits costs - less current portion 101.2   101.2      
Due to affiliates - long term 0.0   0.0      
Other liabilities 45.4   46.0      
Leases - right of use liabilities 21.9          
Deferred taxes 98.7   104.3      
Total noncurrent liabilities 589.6   551.0      
Preferred stock 0.0   0.0      
Common stock 1.0   1.0      
Other shareholders' equity 688.9   761.2      
Total shareholders’ equity 689.9 $ 709.4 762.2 $ 833.5 $ 853.1 $ 829.6
TOTAL 1,491.8   1,537.5      
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 (682.8)   (722.8)      
Leases - right of use assets 0.0          
Due from affiliates - long term (1,272.7)   (1,276.5)      
Other assets 0.0   0.0      
TOTAL (1,955.5)   (1,999.3)      
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      
Term loan - current 0.0          
Revolving credit facility 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      
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      
Due to affiliates - long term (1,272.7)   (1,276.5)      
Other liabilities 0.0   0.0      
Leases - right of use liabilities 0.0          
Deferred taxes 0.0   0.0      
Total noncurrent liabilities (1,272.7)   (1,276.5)      
Preferred stock 0.0   0.0      
Common stock (0.1)   (0.1)      
Other shareholders' equity (682.7)   (722.7)      
Total shareholders’ equity (682.8)   (722.8)      
TOTAL (1,955.5)   (1,999.3)      
The Company [Member] | Reportable Legal Entities [Member]            
Condensed Balance Sheet Statements, Captions [Line Items]            
Cash & cash equivalents 1.5   0.1      
Restricted cash 0.0   0.0      
Accounts receivable - net 0.0   0.5      
Due from affiliates 0.0   0.0      
Inventories 0.0   0.0      
Prepaid and other current assets 12.3   6.4      
Total current assets 13.8   7.0      
Property, plant and equipment - net 18.1   20.6      
Investment in subsidiaries 625.1   668.3      
Leases - right of use assets 5.9          
Due from affiliates - long term 742.2   751.7      
Other assets 35.4   29.8      
TOTAL 1,440.5   1,477.4      
Accounts payable, trade 2.9   3.7      
Due to affiliates 0.0   0.0      
Accrued and other current liabilities 26.7   15.8      
Accrued employee benefits costs 1.9   1.9      
Term loan - current 15.0          
Revolving credit facility 0.4   23.3      
Industrial revenue bonds 0.0   0.0      
Total current liabilities 46.9   44.7      
Senior notes payable 249.0   248.6      
Term loan - less current portion 25.0          
Accrued pension benefits costs - less current portion 22.3   23.2      
Accrued postretirement benefits costs - less current portion 1.0   0.7      
Due to affiliates - long term 395.2   395.4      
Other liabilities 5.9   2.8      
Leases - right of use liabilities 5.6          
Deferred taxes (0.3)   (0.2)      
Total noncurrent liabilities 703.7   670.5      
Preferred stock 0.0   0.0      
Common stock 1.0   1.0      
Other shareholders' equity 688.9   761.2      
Total shareholders’ equity 689.9   762.2      
TOTAL 1,440.5   1,477.4      
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]            
Condensed Balance Sheet Statements, Captions [Line Items]            
Cash & cash equivalents 0.0   0.0      
Restricted cash 0.8   0.8      
Accounts receivable - net 70.6   81.8      
Due from affiliates 22.9   13.1      
Inventories 199.0   210.7      
Prepaid and other current assets 0.9   3.4      
Total current assets 294.2   309.8      
Property, plant and equipment - net 326.2   320.7      
Investment in subsidiaries 57.7   54.5      
Leases - right of use assets 1.4          
Due from affiliates - long term 526.6   517.6      
Other assets 4.2   2.1      
TOTAL 1,210.3   1,204.7      
Accounts payable, trade 86.3   84.1      
Due to affiliates 0.0   0.0      
Accrued and other current liabilities 25.1   22.8      
Accrued employee benefits costs 8.3   8.3      
Term loan - current 0.0          
Revolving credit facility 0.0   0.0      
Industrial revenue bonds 7.8   7.8      
Total current liabilities 127.5   123.0      
Senior notes payable 0.0   0.0      
Term loan - less current portion 0.0          
Accrued pension benefits costs - less current portion 20.7   20.7      
Accrued postretirement benefits costs - less current portion 98.6   98.9      
Due to affiliates - long term 295.4   307.6      
Other liabilities 22.0   23.5      
Leases - right of use liabilities 0.2          
Deferred taxes 1.8   1.8      
Total noncurrent liabilities 438.7   452.5      
Preferred stock 0.0   0.0      
Common stock 0.0   0.0      
Other shareholders' equity 644.1   629.2      
Total shareholders’ equity 644.1   629.2      
TOTAL 1,210.3   1,204.7      
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]            
Condensed Balance Sheet Statements, Captions [Line Items]            
Cash & cash equivalents 21.0   38.8      
Restricted cash 0.0   0.0      
Accounts receivable - net 11.3   0.2      
Due from affiliates 0.4   9.6      
Inventories 123.3   133.1      
Prepaid and other current assets 10.1   8.2      
Total current assets 166.1   189.9      
Property, plant and equipment - net 605.8   626.0      
Investment in subsidiaries 0.0   0.0      
Leases - right of use assets 16.9          
Due from affiliates - long term 5.3   7.2      
Other assets 2.4   31.6      
TOTAL 796.5   854.7      
Accounts payable, trade 22.8   31.6      
Due to affiliates 0.0   10.3      
Accrued and other current liabilities 14.3   13.9      
Accrued employee benefits costs 0.8   0.8      
Term loan - current 0.0          
Revolving credit facility 0.0   0.0      
Industrial revenue bonds 0.0   0.0      
Total current liabilities 37.9   56.6      
Senior notes payable 0.0   0.0      
Term loan - less current portion 0.0          
Accrued pension benefits costs - less current portion 5.4   7.0      
Accrued postretirement benefits costs - less current portion 1.6   1.6      
Due to affiliates - long term 582.1   573.5      
Other liabilities 17.5   19.7      
Leases - right of use liabilities 16.1          
Deferred taxes 97.2   102.7      
Total noncurrent liabilities 719.9   704.5      
Preferred stock 0.0   0.0      
Common stock 0.1   0.1      
Other shareholders' equity 38.6   93.5      
Total shareholders’ equity 38.7   93.6      
TOTAL $ 796.5   $ 854.7