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LONG-TERM DEBT - Interest on Long-term Debt (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
LONG-TERM DEBT |  |
Interest expense | $ 70.0 | $ 63.1
Borrowing costs capitalized | $ 6.4 | $ 3.1
Capitalization rate (as a percent) | 1.37% | 1.70%
Credit Facility |  |
LONG-TERM DEBT |  |
Cash interest paid | $ 0.1 | $ 3.6
Cash standby fees paid | 5.6 | 5.2
Notes |  |
LONG-TERM DEBT |  |
Cash interest paid | $ 71.3 | $ 59.8

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2017-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2017-03-01&anchor=para_26_a&doctype=Standard -URIDate 2017-03-09 + Details
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