RESTRUCTURING, INTEGRATION AND OTHER COSTS - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) employee	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Cost-rationalization and integration initiatives
Acquisition-related costs, since acquisition date	$ 1.8	$ 13.9
Salix
Cost-rationalization and integration initiatives
Estimated integration costs	300.0
Restructuring and acquisition-related costs since acquisition date	238.0
Integration expenses related to acquisition, since acquisition date	123.0
Restructuring expenses related to acquisition, since acquisition date	100.0
Acquisition-related costs, since acquisition date	$ 15.0
Approximate number of employees expected to be terminated | employee	475
Payments for integration costs	$ 8.0
Integration/other charges incurred	13.0
Restructuring payments	11.4		$ 58.1
Other Restructuring, Integration-related and Other Costs
Cost-rationalization and integration initiatives
Incurred restructuring costs	17.0	55.0
Restructuring costs integration consulting duplicate labor transition service and other	13.0	28.0
Business exit costs	2.0	2.0
Integration/other charges incurred		1.0
Severance costs	2.0	24.0
Restructuring payments	$ 20.0	$ 65.0