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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Supplemental cash flow information |  |
Cash (paid) for interest, net of amount capitalized | $ (68.5) | $ (56.6)
Cash received for income taxes, net | 0.3 | 8.9
Significant non-cash transactions |  |
Accounts payable related to construction costs | 74.9 | 116.4
Portion of Bostco real estate holdings sale financed with note receivable | 0.0 | 7.0
Amortization of deferred revenue | $ 6.3 | $ 6.2

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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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