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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  |  | December 31,
Dollar amounts in millions | Interest Rate 2015 |  | 2015 |  | 2014
|  |  | Principal |  | Unamortized Debt Costs |  | Total |  | Principal |  | Unamortized Debt Costs |  | Total
Debentures: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes, maturing 2020, interest rates fixed | 7.5 | % |  | $ | 350.0 |  |  | $ | (3.7 | ) |  | $ | 346.3 |  |  | $ | 350.0 |  |  | $ | (4.4 | ) |  | $ | 345.6 |
Bank credit facilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Chilean term credit facility, maturing 2019, interest rates fixed | UF+3.9% |  |  | 12.8 |  |  |  |  | 12.8 |  |  | 14.4 |  |  |  |  | 14.4 |
Brazilian export financing facility, maturing 2017, interest rates fixed | 6.65 | % |  | 4.0 |  |  |  |  | 4.0 |  |  | 6.0 |  |  |  |  | 6.0 |
Limited recourse notes payable: |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, payable 2018, interest rates fixed | 7.3 | % |  | 22.0 |  |  |  |  | 22.0 |  |  | 22.0 |  |  |  |  | 22.0 |
Other financing: |  |  |  |  |  |  |  |  |  |  |  |  |
Non-recourse notes payable 2018, interest rates variable | 0.2 | % |  | 368.7 |  |  | (0.2 | ) |  | 368.5 |  |  | 368.7 |  |  | (0.3 | ) |  | 368.4 |
Other |  |  | 0.3 |  |  |  |  | 0.3 |  |  | 0.8 |  |  |  |  | 0.8 |
Total |  |  | 757.8 |  |  | (3.9 | ) |  | 753.9 |  |  | 761.9 |  |  | (4.7 | ) |  | 757.2 |
Less: current portion |  |  | (2.1 | ) |  |  |  | (2.1 | ) |  | (2.4 | ) |  |  |  | (2.4 | )
Net long-term portion |  |  | $ | 755.7 |  |  | $ | (3.9 | ) |  | $ | 751.8 |  |  | $ | 759.5 |  |  | $ | (4.7 | ) |  | $ | 754.8 |
Schedule of Maturities of Long-term Debt [Table Text Block] | The weighted average interest rate for all long-term debt at December 31, 2015 and 2014 was approximately 4.0 percent for both periods. Required repayment of principal for long-term debt is as follows:
Dollar amounts in millions |
Year ended December 31, |
2016 | $ | 2.1 |
2017 | 6.4 |
2018 | 395.0 |
2019 | 4.3 |
2020 | 350.0 |
2021 and after | — |
Total | $ | 757.8 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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 210.5-02.22) -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 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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