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DEBT (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 5.79%, payable through 2020 | Dec. 31, 2013 5.79%, payable through 2020 | Mar. 31, 2014 3.66%, payable through 2023 | Dec. 31, 2013 3.66%, payable through 2023 | Mar. 31, 2014 4.16%, payable through 2027 | Dec. 31, 2013 4.16%, payable through 2027 | Mar. 31, 2014 4.31%, payable through 2032 | Dec. 31, 2013 4.31%, payable through 2032 | Mar. 31, 2014 5.34% payable through 2028 | Dec. 31, 2013 5.34% payable through 2028 | Mar. 31, 2014 5.27% payable through 2029 | Dec. 31, 2013 5.27% payable through 2029 | Mar. 31, 2014 4.35%, payable through 2044 | Jan. 31, 2014 Senior unsecured long-term debt | Jan. 31, 2014 Senior unsecured long-term debt 2021 | Jan. 31, 2014 Senior unsecured long-term debt 2022 and 2023 | Jan. 31, 2014 Senior unsecured long-term debt 2024 to 2027 | Jan. 31, 2014 Senior unsecured long-term debt 2028 | Jan. 31, 2014 Senior unsecured long-term debt Starting in 2029, and thereafter until 2044
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital leases | $ 2.1 | $ 2.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | 383.6 | 286.1 | 45.5 | 45.5 | 77.5 | 77.5 | 55.0 | 55.0 | 37.5 | 37.5 | 31.9 | 33.0 | 34.1 | 35.2 | 100.0 |  |  |  |  |  |
Less current portion | (12.5) | (12.5) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 371.1 | 273.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.79% | 5.79% | 3.66% | 3.66% | 4.16% | 4.16% | 4.31% | 4.31% | 5.34% | 5.34% | 5.27% | 5.27% | 4.35% | 4.35% |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |
Weighted average period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 years 6 months |  |  |  |  |  |
Annual principal payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 | $ 7.5 | $ 10.0 | $ 8.0 | $ 2.0

X
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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