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STOCK-BASED COMPENSATION. (Future Stock-Based Compensation Expense) (Details)
$ in Millions
Jun. 30, 2020
USD ($)
Share-based Payment Arrangement [Abstract]  
Third quarter 2020 $ 53.6
Fourth quarter 2020 46.7
2021 108.7
2022 through 2026 90.0
Total $ 299.0