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STOCK-BASED COMPENSATION: Stock-based compensation activity, by award type (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Share-based compensation |  |
Other non-employee stock-based compensation | $ 0.6 | $ 0.6
Total non-cash stock-based compensation | 40.7 | 42.0
Total non-cash stock-based compensation included in the consolidated statements of equity | 27.9 | 31.3
Stock options |  |
Share-based compensation |  |
Share-based compensation expense | 1.4 | 1.8
Restricted stock units |  |
Share-based compensation |  |
Share-based compensation expense | 24.8 | 25.4
Arbor Holdback Agreement | Arbor |  |
Share-based compensation |  |
Share-based compensation expense | 0.0 | 2.6
Consideration Holdback | Data Plus Math Corporation |  |
Share-based compensation |  |
Share-based compensation expense | 4.0 | 2.1
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC |  |
Share-based compensation |  |
Share-based compensation expense | 9.2 | 9.5
Liability-based equity awards |  |
Share-based compensation |  |
Total non-cash stock-based compensation | (12.8) | (10.7)
Acuity Performance Earnout | Acuity Data |  |
Share-based compensation |  |
Share-based compensation expense | $ 0.7 | $ 0.0

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