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EQUITY - TOTAL STOCK BASED COMPENSATION EXPENSE AND THE TAX RELATED BENEFIT (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |
Stock option expense | $ 7.1 | $ 6.6 | $ 15.4
RSU expense | 57.8 | 13.2 | 31.2
Total stock based compensation expense | 64.9 | 19.8 | 46.6
Related deferred income tax benefit | $ 8.4 | $ 2.4 | $ 8.4

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