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Debt (Tables) | 3 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Debt |
| March 31, 2018 |  | December 31, 2017
Debt classified as current liabilities: |  |  |
Hancock County industrial revenue bonds ("IRBs") due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (1) | $ | 7.8 |  |  | $ | 7.8 |
Debt classified as non-current liabilities: |  |  |
7.5% senior secured notes due June 1, 2021, net of debt discount of $1.7 million and $1.8 million, respectively, interest payable semiannually | 248.3 |  |  | 248.2 |
Total | $ | 256.1 |  |  | $ | 256.0 |
(1) The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The IRB interest rate at March 31, 2018 was 1.78%.
Schedule of Line of Credit Facilities |
Status of our Iceland revolving credit facility: | March 31, 2018
Credit facility maximum amount | $ | 50.0 |
Borrowing availability | 50.0 |
Outstanding borrowings | — |
Borrowing availability, net of borrowings | 50.0 |
Status of our U.S. revolving credit facility: | March 31, 2018
Credit facility maximum amount | $ | 150.0 |
Borrowing availability | 150.0 |
Outstanding letters of credit issued | 39.1 |
Outstanding borrowings | — |
Borrowing availability, net of outstanding letters of credit and borrowings | 110.9 |

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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