INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income tax Expense Benefit
Income tax expense (benefit)	$ 13.1	$ 1.0	$ (67.8)	$ (24.1)
Valuation allowance against deferred tax assets	1,030.0		1,030.0		$ 859.0
Unrecognized tax benefits including interest and penalties	359.0		359.0
Unrecognized tax benefits related to interest and penalties	40.0		40.0
Portion of unrecognized tax benefits, if recognized, would reduce the Company's effective tax rate	102.0		102.0
Accrued interest related to unrecognized tax benefits	33.0		33.0
Accrued penalties related to unrecognized tax benefits	7.0		7.0
Outside of Canada
Income tax Expense Benefit
Income tax expense (benefit)	$ 13.0		(67.0)
Canada
Income tax Expense Benefit
Income tax expense (benefit)			$ (1.0)