Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions |
Common Stock [Member] |
Additional Paid-in Capital [Member] |
Retained Earnings [Member] |
Accumulated Other Comprehensive Income [Member] |
Total |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| Beginning balance, Shares at May. 31, 2020 | 358.8 | ||||||||||
| Beginning balance at May. 31, 2020 | $ 3.6 | $ 1,289.9 | $ 1,431.4 | $ 56.5 | $ 2,781.4 | ||||||
| Net income | 484.0 | 484.0 | |||||||||
| Unrealized (losses) gains on securities, net of tax (benefit) expense | 7.3 | 7.3 | |||||||||
| Reclassification adjustment for realized gains on securities, net of tax expense | [1] | (0.5) | (0.5) | ||||||||
| Cash dividends declared | (446.7) | (446.7) | |||||||||
| Repurchases of common shares, Shares | [2] | (0.4) | |||||||||
| Repurchases of common shares | [2] | (0.7) | (28.1) | (28.8) | |||||||
| Stock-based compensation costs | 25.5 | 25.5 | |||||||||
| Foreign currency translation adjustment | 9.8 | 9.8 | |||||||||
| Activity related to equity-based plans, Shares | 2.2 | ||||||||||
| Activity related to equity-based plans | 79.4 | (21.7) | 57.7 | ||||||||
| Ending balance, Shares at Nov. 30, 2020 | 360.6 | ||||||||||
| Ending balance at Nov. 30, 2020 | $ 3.6 | 1,394.1 | 1,418.9 | 73.1 | 2,889.7 | ||||||
| Beginning balance, Shares at Aug. 31, 2020 | 359.5 | ||||||||||
| Beginning balance at Aug. 31, 2020 | $ 3.6 | 1,325.3 | 1,370.2 | 79.5 | 2,778.6 | ||||||
| Net income | 272.4 | 272.4 | |||||||||
| Unrealized (losses) gains on securities, net of tax (benefit) expense | (5.7) | (5.7) | |||||||||
| Reclassification adjustment for realized gains on securities, net of tax expense | [1] | (0.3) | (0.3) | ||||||||
| Cash dividends declared | (223.5) | (223.5) | |||||||||
| Stock-based compensation costs | 12.2 | 12.2 | |||||||||
| Foreign currency translation adjustment | (0.4) | (0.4) | |||||||||
| Activity related to equity-based plans, Shares | 1.1 | ||||||||||
| Activity related to equity-based plans | 56.6 | (0.2) | 56.4 | ||||||||
| Ending balance, Shares at Nov. 30, 2020 | 360.6 | ||||||||||
| Ending balance at Nov. 30, 2020 | $ 3.6 | 1,394.1 | 1,418.9 | 73.1 | $ 2,889.7 | ||||||
| Beginning balance, Shares at May. 31, 2021 | 359.8 | 359.8 | |||||||||
| Beginning balance at May. 31, 2021 | $ 3.6 | 1,446.7 | 1,445.9 | 51.8 | $ 2,948.0 | ||||||
| Net income | 665.7 | 665.7 | |||||||||
| Unrealized (losses) gains on securities, net of tax (benefit) expense | (32.7) | (32.7) | |||||||||
| Reclassification adjustment for realized gains on securities, net of tax expense | [3] | (0.1) | (0.1) | ||||||||
| Cash dividends declared | (476.4) | (476.4) | |||||||||
| Stock-based compensation costs | 26.4 | 26.4 | |||||||||
| Foreign currency translation adjustment | (15.2) | (15.2) | |||||||||
| Activity related to equity-based plans, Shares | 1.0 | ||||||||||
| Activity related to equity-based plans | $ 0.0 | 32.4 | (28.3) | $ 4.1 | |||||||
| Ending balance, Shares at Nov. 30, 2021 | 360.8 | 360.8 | |||||||||
| Ending balance at Nov. 30, 2021 | $ 3.6 | 1,505.5 | 1,606.9 | 3.8 | $ 3,119.8 | ||||||
| Beginning balance, Shares at Aug. 31, 2021 | 360.6 | ||||||||||
| Beginning balance at Aug. 31, 2021 | $ 3.6 | 1,481.5 | 1,513.3 | 45.1 | 3,043.5 | ||||||
| Net income | 332.1 | 332.1 | |||||||||
| Unrealized (losses) gains on securities, net of tax (benefit) expense | (32.2) | (32.2) | |||||||||
| Cash dividends declared | (238.3) | (238.3) | |||||||||
| Stock-based compensation costs | 14.0 | 14.0 | |||||||||
| Foreign currency translation adjustment | (9.1) | (9.1) | |||||||||
| Activity related to equity-based plans, Shares | 0.2 | ||||||||||
| Activity related to equity-based plans | $ 0.0 | 10.0 | (0.2) | $ 9.8 | |||||||
| Ending balance, Shares at Nov. 30, 2021 | 360.8 | 360.8 | |||||||||
| Ending balance at Nov. 30, 2021 | $ 3.6 | $ 1,505.5 | $ 1,606.9 | $ 3.8 | $ 3,119.8 | ||||||
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