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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for grant | 44.1 |  |
Shares available for future grants | 17.3 |  |
Stock-based compensation expense | $ 47.4 | $ 46.2 | $ 44.6
Income tax benefits related to stock-based compensation | 9.0 | 8.9 | 14.5
Total unrecognized compensation cost related to all unvested stock-based awards | $ 65.0 |  |
Weighted-average period in years of all unvested stock-based awards | 2 years 9 months 18 days |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual life | 10 years |  |
Performance-Based RSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 2 years |  |
Service period | 1 year |  |
Time-Based Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
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 |  |
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 |  |
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%
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% |  |

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