SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended			6 Months Ended		9 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jan. 01, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cumulative-effect adjustment, accumulated deficit (less than $2 million and less than $1 million)									$ 30.0
Change in cash provided by operating activities						$ 1,574.5	$ 1,659.8
Change in cash provided by financing activities						$ (1,388.3)	13,501.5
Accumulated Deficit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cumulative-effect adjustment, accumulated deficit (less than $2 million and less than $1 million)									30.0
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred tax asset adjustment								$ 30.0
Cumulative-effect adjustment, accumulated deficit (less than $2 million and less than $1 million)	$ 1.0	$ 2.0		$ 1.0
Change in cash provided by operating activities		(1.0)	$ 18.0	(1.0)	$ 26.0		22.0
Change in cash provided by financing activities		$ 1.0	$ (18.0)	$ (1.0)	$ (26.0)		(22.0)
Change in diluted weighted-average common shares outstanding	(0.1)	0.6		0.2
New Accounting Pronouncement, Early Adoption, Effect | Accumulated Deficit | Accounting Standards Update 2016-09
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cumulative-effect adjustment, accumulated deficit (less than $2 million and less than $1 million)									$ 30.0
Deferred Income Taxes Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Reclassification adjustment							14.0
Accounts Payable and Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Reclassification adjustment							$ (14.0)