COMMITMENTS AND CONTINGENT LIABILITIES (Details) CAD in Millions, $ in Millions	3 Months Ended					12 Months Ended
	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 27, 2016 USD ($)	Feb. 19, 2015 USD ($)	Aug. 24, 2012 Recipients $ / Violation
Loss Contingencies [Line Items]
Percent of lowest maximum (cap on payments)						80.00%
Payment reduction by Assembly Bill No. 97						10.00%
Other Inventory, Supplies, Gross								$ 195.2		$ 171.7
Loss related to litigation settlement	$ 34.5				$ 34.5
Previously recorded litigation reserve in connection with false claims act lawsuit					$ 15.0					$ 15.0
Payment of legal settlement		$ 49.5				$ 12.2
AHS transfer to Canadian JV | CAD							CAD 50.0
Total acquisition consideration (cash and non-cash)									$ 1,224.5		$ 249.1	$ 6,150.7
Number of recipients | Recipients													39
Proposed damages per violation | $ / Violation													0.0005
Letters of credit								72.2
Future minimum rental commitments [Abstract]
2013								196.1
2014								149.0
2015								109.7
2016								83.5
2017								64.2
Thereafter								160.9
Total minimum lease payments								763.4
Less: amounts included in restructuring and acquisition related accruals								(17.6)
Less: non-cancelable sub-lease income								0.0
Total minimum operating lease payments								$ 745.8
Rental expense	$ 291.2		$ 287.1			$ 313.8
Litigation Settlement, Amount (Deprecated 2017-01-31)				$ 49.5