ACQUISITIONS - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 01, 2017	Jan. 23, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 1,126.5	$ 626.1	$ 628.3
Harpoon Medical
Business Acquisition [Line Items]
Current assets	$ 3.6
Property and equipment, net	0.3
Goodwill	142.1
IPR&D	53.1		$ 53.1
Other assets	0.1
Current liabilities assumed	(0.8)
Deferred income taxes	(12.7)
Total cash purchase price	185.7
Less: cash acquired	(3.5)
Total purchase price, net of cash acquired	$ 182.2
Valtech
Business Acquisition [Line Items]
Current assets		$ 22.7
Property and equipment, net		1.2
Goodwill		316.5
Other assets		0.8
Current liabilities assumed		(5.1)
Deferred income taxes		(17.6)
Total cash purchase price		515.6
Less: cash acquired		(4.3)
Total purchase price, net of cash acquired		511.3
Developed technology | Valtech
Business Acquisition [Line Items]
IPR&D		109.2
IPR&D | Valtech
Business Acquisition [Line Items]
IPR&D		$ 87.9