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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