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Guarantees (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2021
Guarantor Obligations |  |  |
Contingent liability for standby letters of credit issued under the Company’s revolving credit facility | $ 7.5 |  | $ 7.7
Amounts drawn for letters of credit under the Company’s revolving credit facility | 0.0 |  | 0.0
Investment earnings | 1.2 | $ 2.0 |
Advanced Filtration Systems, Inc. |  |  |
Guarantor Obligations |  |  |
AFSI outstanding debt (the Company guarantees half) | $ 38.6 |  | $ 37.8

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