INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Income Tax [Line Items]
(Recovery of) provision for income taxes	$ 72.8	$ 13.1	$ 65.6	$ (71.4)
Valuation allowance against deferred tax assets	1,800.0		1,800.0		$ 1,370.0
Unrecognized tax benefits including interest and penalties	346.0		346.0
Unrecognized tax benefits related to interest and penalties	46.0		46.0
Portion of unrecognized tax benefits, if recognized, would reduce the Company's effective tax rate	126.0		126.0
Accrued interest related to unrecognized tax benefits	40.0		40.0		46.0
Accrued penalties related to unrecognized tax benefits	6.0		6.0		$ 7.0
Outside of Canada
Income Tax [Line Items]
(Recovery of) provision for income taxes	$ 73.0		$ 66.0

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: 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.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The gross amount of unrecognized tax benefits including interest and penalties pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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