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Summary of Significant Accounting Policies - Debt (Details) - USD ($) $ in Millions | Feb. 28, 2022 | Feb. 28, 2021
--- | --- | ---
Senior Notes | Unsecured Senior Notes Due March 31, 2018 |  |
Debt Instrument [Line Items] |  |
Fair value of notes | $ 144.0 | $ 144.8

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