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SHARE-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | $ 89.3 | $ 70.7 | $ 248.2 | $ 192.2
Income tax benefit | 18.1 | 14.9 | 51.0 | 40.0
Share-based compensation expense after income taxes | 71.2 | 55.8 | 197.2 | 152.2
Total cost of sales |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | 18.0 | 14.6 | 49.7 | 39.7
Total cost of sales | Cost of sales - products |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | 12.4 | 10.1 | 34.8 | 27.2
Total cost of sales | Cost of sales - services |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | 5.6 | 4.5 | 14.9 | 12.5
Selling, general and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | 44.7 | 35.9 | 124.0 | 98.1
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | $ 26.6 | $ 20.2 | $ 74.5 | $ 54.4

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