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SHARE-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | $ 110.1 | $ 96.4 | $ 214.3 | $ 187.6
Income tax benefit | 22.5 | 20.0 | 43.1 | 38.9
Share-based compensation expense after income taxes | 87.6 | 76.4 | 171.2 | 148.7
Total cost of sales |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | 21.8 | 19.4 | 42.8 | 37.7
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 | 16.6 | 14.2 | 31.9 | 27.0
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 | 5.2 | 5.2 | 10.9 | 10.7
Selling, general and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | 55.7 | 49.6 | 108.8 | 95.3
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense before income taxes | $ 32.6 | $ 27.4 | $ 62.7 | $ 54.6

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