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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2023 | May 31, 2022 | May 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized for grant |  | 46,500,000 |  |
Shares available for future grants |  | 14,200,000 |  |
Stock-based compensation expense |  | $ 62.6 | $ 52.8 | $ 52.5
Income tax benefits related to stock-based compensation |  | 12.1 | $ 9.8 | 8.6
Total unrecognized compensation cost related to all unvested stock-based awards |  | $ 97.5 |  |
Weighted-average period in years of all unvested stock-based awards |  | 2 years 8 months 12 days |  |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted |  | 300,000 |  |
Contractual life |  | 10 years |  |
Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards granted | [1] | 600,000 |  |
Outstanding balance |  | 1,400,000 | 1,300,000 |
Performance-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period |  | 2 years |  |
Service period |  | 1 year |  |
Awards granted | [1] | 100,000 |  |
Outstanding balance |  | 100,000 | 100,000 |
Time-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Awards granted |  | 0 |  |
Outstanding balance |  | 100,000 | 100,000 |
Performance-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period |  | 2 years |  |
Service period |  | 1 year |  |
Awards granted |  | 0 |  |
Outstanding balance |  | 100,000 | 100,000 |
Director [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Non-Executive [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 5 years |
Executive [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 3 years |  |
Outside Directors [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 1 year |  |
Tranche One [Member] | Time-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting percentage |  | 33.30% |  |
Tranche One [Member] | Officer [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting percentage |  | 33.30% |  |
Tranche One [Member] | Non-Executive [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting percentage |  |  | 20.00% |
Tranche One [Member] | Executive [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting percentage |  | 33.30% |  |
Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 0.0 | $ 0.0 | $ 0.0
Discount to the market price |  | 5.00% | 5.00% | 5.00%
Minimum [Member] | Non-Executive [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 4 years |  |
Maximum [Member] | Non-Executive [Member] | Time-Based RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  | 5 years |  |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Discount to the market price |  | 15.00% |  |
[1] | For performance-based RSUs, granted number assumes achievement of performance goals at target. Actual number of shares to be earned may differ from this amount.

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