ACQUISITIONS - Identifiable intangible assets (Details) - USD ($) $ in Millions			12 Months Ended
	Oct. 19, 2015	Apr. 01, 2015	Dec. 31, 2015	Sep. 30, 2016
Amoun
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)	10 years
Total identifiable intangible assets acquired				$ 520.2
Amoun | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired	$ 528.0
Amoun | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				(7.8)
Amoun | Product brands
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)	9 years
Total identifiable intangible assets acquired				479.8
Amoun | Product brands | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired	$ 490.8
Amoun | Product brands | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				(11.0)
Amoun | Corporate brand
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)	17 years
Total identifiable intangible assets acquired				40.4
Amoun | Corporate brand | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired	$ 37.2
Amoun | Corporate brand | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				3.2
Salix
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)		11 years
Total identifiable intangible assets acquired			$ 6,756.3
Salix | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired		$ 6,756.3
Salix | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			0.0
Salix | Product brands
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)		10 years
Total identifiable intangible assets acquired			6,089.6
Salix | Product brands | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired		$ 6,088.3
Salix | Product brands | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			1.3
Salix | Corporate brand
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)		20 years
Total identifiable intangible assets acquired			666.7
Salix | Corporate brand | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired		$ 668.0
Salix | Corporate brand | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ (1.3)
Other 2015 Acquisitions
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			8 years
Total identifiable intangible assets acquired				1,078.4
Other 2015 Acquisitions | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 1,121.6
Other 2015 Acquisitions | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				(43.2)
Other 2015 Acquisitions | Product brands
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			7 years
Total identifiable intangible assets acquired				735.2
Other 2015 Acquisitions | Product brands | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 741.2
Other 2015 Acquisitions | Product brands | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				(6.0)
Other 2015 Acquisitions | Corporate brand
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			16 years
Total identifiable intangible assets acquired				6.6
Other 2015 Acquisitions | Corporate brand | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 6.6
Other 2015 Acquisitions | Corporate brand | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				0.0
Other 2015 Acquisitions | Product rights
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			3 years
Total identifiable intangible assets acquired				42.0
Other 2015 Acquisitions | Product rights | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 42.7
Other 2015 Acquisitions | Product rights | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				(0.7)
Other 2015 Acquisitions | Partner relationships
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			8 years
Total identifiable intangible assets acquired				7.8
Other 2015 Acquisitions | Partner relationships | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 7.8
Other 2015 Acquisitions | Partner relationships | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				0.0
Other 2015 Acquisitions | Technology/know-how
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			10 years
Total identifiable intangible assets acquired				284.8
Other 2015 Acquisitions | Technology/know-how | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 321.3
Other 2015 Acquisitions | Technology/know-how | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				(36.5)
Other 2015 Acquisitions | Other
Business Acquisition [Line Items]
Weighted- Average Useful Lives (Years)			6 years
Total identifiable intangible assets acquired				2.0
Other 2015 Acquisitions | Other | Amounts Recognized as of Acquisition Date (as previously reported)
Business Acquisition [Line Items]
Total identifiable intangible assets acquired			$ 2.0
Other 2015 Acquisitions | Other | Measurement Period Adjustments
Business Acquisition [Line Items]
Total identifiable intangible assets acquired				$ 0.0