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STOCK-BASED COMPENSATION: Stock-based compensation activity, by award type (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Share-based compensation |  |
Other non-employee stock-based compensation | $ 0.3 | $ 0.3
Total non-cash stock-based compensation | 16.5 | 18.6
Total non-cash stock-based compensation included in the consolidated statements of equity | 10.5 | 15.1
Stock options |  |
Share-based compensation |  |
Share-based compensation expense | 0.8 | 0.7
Restricted stock units |  |
Share-based compensation |  |
Share-based compensation expense | 8.9 | 11.1
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 | 1.9 | 0.0
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC |  |
Share-based compensation |  |
Share-based compensation expense | 4.6 | 3.9
Liability-based equity awards |  |
Share-based compensation |  |
Total non-cash stock-based compensation | $ (6.0) | $ (3.5)

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