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STOCKHOLDERS' EQUITY: Stock-based compensation activity, by award type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Share-based compensation |  |  |
Other non-employee stock-based compensation | $ 1.1 | $ 1.3 | $ 1.0
Total non-cash stock-based compensation | 89.4 | 102.7 | 52.9
Stock-based compensation of discontinued operations | 0.0 | 62.8 | 10.3
Total non-cash stock-based compensation included in the consolidated statements of equity | 65.2 | 151.3 | 61.5
Stock options |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 3.7 | 3.3 | 5.0
Restricted stock units |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 55.5 | 67.0 | 29.1
Arbor Holdback Agreement | Arbor |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 2.6 | 15.3 | 15.3
Consideration Holdback | Data Plus Math Corporation |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 6.2 | 0.0 | 0.0
Pacific Data Partners, LLC Agreement Plan | Pacific Data Partners LLC |  |  |
Share-based compensation |  |  |
Share-based compensation expense | 20.3 | 15.8 | 2.0
Liability-based equity awards |  |  |
Share-based compensation |  |  |
Total non-cash stock-based compensation | $ (24.2) | $ (14.2) | $ (1.7)

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