INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax [Line Items]
Provision for income taxes	$ 7.2	$ 84.5
Valuation allowance against deferred tax assets	1,460.0		$ 1,370.0
Unrecognized tax benefits including interest and penalties	347.0
Unrecognized tax benefits related to interest and penalties	46.0
Portion of unrecognized tax benefits, if recognized, would reduce the Company's effective tax rate	126.0
Accrued interest related to unrecognized tax benefits	40.0	33.0
Accrued penalties related to unrecognized tax benefits	6.0	$ 7.0
Outside of Canada
Income Tax [Line Items]
Provision for income taxes	$ 7.0