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Supplemental Information (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 01, 2020 | Nov. 30, 2020 | Aug. 31, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019 | May 31, 2020
Amortization of operating lease right-of-use assets |  |  | $ 24.4 |  |  |  |
Depreciation expense |  | $ 30.4 |  | $ 33.1 | $ 61.7 | $ 64.9 |
Amortization expense |  | 18.2 |  | 21.9 | 36.5 | 43.0 |
Impairment loss relates to goodwill or intangible assets |  |  |  |  | 0.0 | 0.0 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Unused amount available |  | $ 1,700.0 |  |  | $ 1,700.0 |  |
Weighted-average interest rate |  | 1.22% |  |  | 1.22% |  | 1.28%
Standby Letters of Credit [Member] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 147.9 |  |  | $ 147.9 |  | $ 147.9
Amounts outstanding |  | $ 0.0 |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Standby Letters of Credit [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Expiration date | Dec. 05, 2021 |  |  |  |  |  |
Standby Letters of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |
Expiration date |  |  |  |  | Dec. 05, 2020 |  |
Standby Letters of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |
Expiration date |  |  |  |  | Jul. 15, 2022 |  |

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