SHARE-BASED COMPENSATION - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components and classification of share-based compensation expense
Share-based compensation expense	$ 36.8	$ 50.5	$ 134.0	$ 111.4
Research and development expenses
Components and classification of share-based compensation expense
Share-based compensation expense	1.7	1.5	5.0	4.5
Selling, general and administrative expenses
Components and classification of share-based compensation expense
Share-based compensation expense	35.1	49.0	129.0	106.9
Stock options
Components and classification of share-based compensation expense
Share-based compensation expense	4.7	8.3	11.4	15.7
RSUs
Components and classification of share-based compensation expense
Share-based compensation expense	$ 32.1	$ 42.2	$ 122.6	$ 95.7