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Supplemental Information (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 17, 2021 | Nov. 30, 2021 | Nov. 30, 2020 | Aug. 31, 2020 | Nov. 30, 2021 | Nov. 30, 2020 | May 31, 2021
Goodwill |  | $ 1,832.3 |  |  | $ 1,832.3 |  | $ 1,820.7
Amortization of operating lease right-of-use assets |  |  |  | $ 24.4 |  |  |
Loss on disposal |  |  |  | $ 5.1 |  |  |
Depreciation expense |  | 32.5 | $ 30.4 |  | 63.2 | $ 61.7 |
Amortization expense |  | 16.1 | 18.2 |  | 31.1 | 36.5 |
Impairment loss relates to goodwill or intangible assets |  |  |  |  | 0.0 | 0.0 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Unused amount available |  | $ 2,000.0 |  |  | $ 2,000.0 |  |
Weighted-average interest rate |  | 1.19% |  |  | 1.19% |  | 1.16%
Standby Letters of Credit [Member] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 149.7 |  |  | $ 149.7 |  | $ 180.4
Amounts outstanding |  | $ 0.0 | $ 0.0 |  | $ 0.0 | $ 0.0 | $ 0.0
Standby Letters of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |
Expiration date |  |  |  |  | Dec. 23, 2021 |  |
Standby Letters of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |
Expiration date |  |  |  |  | Dec. 05, 2022 |  |
JPM $1 Billion Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,000.0 |  |  |  |  |  |
JPM $500 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Maximum borrowing capacity | 500.0 |  |  |  |  |  |
JPM $750 Million Credit Facility [Member] | JP Morgan Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 750.0 |  |  |  |  |  |
Expiration date | Sep. 17, 2026 |  |  |  |  |  |

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