COMMITMENTS AND CONTINGENT LIABILITIES (Details) $ in Millions, $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jul. 27, 2016 USD ($)	Aug. 24, 2012 Recipients $ / Violation
Loss Contingencies [Line Items]
Other Inventory, Supplies, Gross				$ 200.1		$ 195.2
Loss related to litigation settlement	$ 34.5
Previously recorded litigation reserve in connection with false claims act lawsuit						$ 15.0
Payment of legal settlement		$ 49.5
AHS transfer to Canadian JV					$ 50.0
Total acquisition consideration (cash and non-cash)							$ 1,224.5	$ 249.1
Number of recipients | Recipients									39
Proposed damages per violation | $ / Violation									0.0005
Amount Outstanding 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				(21.9)
Less: non-cancelable sub-lease income				0.0
Total minimum operating lease payments				741.5
Rental expense	$ 313.8		$ 291.2	$ 358.7