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Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Debt
 
June 30, 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 $1.6 million and $1.8 million, respectively, interest payable semiannually
248.4

 
248.2

Total
$
256.2

 
$
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 June 30, 2018 was 1.71%.
Schedule of Line of Credit Facilities
Status of our Iceland revolving credit facility:
June 30, 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:
June 30, 2018
Credit facility maximum amount
$
175.0

Borrowing availability
175.0

Outstanding letters of credit issued
38.3

Outstanding borrowings

Borrowing availability, net of outstanding letters of credit and borrowings
136.7