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Business Combinations (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2018 | May 31, 2021 | May 31, 2020 | May 31, 2019
Business Acquisition [Line Items] |  |  |  |
Restricted cash |  | $ 88.3 | $ 71.1 | $ 57.1
Revenues |  | 4,056.8 | 4,040.5 | 3,772.5
Net income |  | 1,097.5 | 1,098.1 | 1,034.4
Goodwill |  | $ 1,820.7 | $ 1,791.1 | 1,782.6
Oasis Outsourcing Group Holdings, L.P. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Effective acquisition date |  | Dec. 20, 2018 |  |
Purchase price | $ 992.2 |  |  |
Cash acquired | 262.3 |  |  |
Restricted cash | $ 132.1 |  |  |
Revenues |  |  |  | 163.7
Net income |  |  |  | 5.1
Incurred acquisition and integration costs |  |  |  | 5.3
Excluded incurred costs related to acquisition |  |  |  | 2.7
Excluded incurred costs related to acquisition, net of tax |  |  |  | $ 2.0

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