Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
May 31, 2025 |
Feb. 28, 2025 |
Nov. 30, 2024 |
May 31, 2024 |
Feb. 29, 2024 |
Nov. 30, 2023 |
May 31, 2025 |
May 31, 2024 |
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| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | $ 2,520.4 | $ 2,463.4 | $ 2,378.8 | $ 2,149.6 | $ 2,064.1 | $ 2,015.4 | $ 2,378.8 | $ 2,015.4 |
| Net income | 98.4 | 77.5 | 106.7 | 113.9 | 89.2 | 100.6 | 282.6 | 303.7 |
| Other comprehensive income (loss) | 28.3 | (11.2) | (16.8) | 0.8 | 1.4 | (1.5) | ||
| Share-based payment amortization, issuances, and cancellations | 10.2 | 10.9 | (11.0) | 10.7 | 11.8 | 2.1 | ||
| Employee stock purchase plan issuances | 0.5 | 0.4 | 0.6 | 0.4 | 0.3 | 0.5 | ||
| Cash dividends paid on common stock | (5.3) | (5.5) | (4.5) | (4.6) | (4.7) | (4.1) | ||
| Stock options exercised | 1.0 | 15.0 | 4.6 | 5.1 | 1.1 | |||
| Repurchases of common stock | (68.5) | (16.1) | (5.4) | (20.7) | (17.6) | (50.0) | ||
| Ending balance | $ 2,584.0 | $ 2,520.4 | $ 2,463.4 | $ 2,254.7 | $ 2,149.6 | $ 2,064.1 | $ 2,584.0 | $ 2,254.7 |
| Cash dividends paid (in dollars per share) | $ 0.17 | $ 0.17 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.13 | ||
| Common Stock Outstanding | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance (in shares) | 31.0 | 31.0 | 30.8 | 30.8 | 30.9 | 31.1 | 30.8 | 31.1 |
| Beginning balance | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 |
| Share-based payment amortization, issuances, and cancellations (in shares) | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.1 | ||
| Stock Issued During Period, Shares, Employee Stock Purchase Plans | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | ||
| Stock options exercised (in shares) | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | |||
| Repurchases of common stock (in shares) | (0.3) | 0.0 | 0.0 | (0.1) | (0.1) | (0.3) | ||
| Ending balance (in shares) | 30.7 | 31.0 | 31.0 | 30.7 | 30.8 | 30.9 | 30.7 | 30.7 |
| Ending balance | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 | $ 0.5 |
| Paid-in Capital | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | 1,132.8 | 1,120.5 | 1,115.9 | 1,087.7 | 1,070.5 | 1,066.8 | 1,115.9 | 1,066.8 |
| Share-based payment amortization, issuances, and cancellations | 10.2 | 10.9 | (11.0) | 10.7 | 11.8 | 2.1 | ||
| Employee stock purchase plan issuances | 0.5 | 0.4 | 0.6 | 0.4 | 0.3 | 0.5 | ||
| Stock options exercised | 1.0 | 15.0 | 4.6 | 5.1 | 1.1 | |||
| Ending balance | 1,143.5 | 1,132.8 | 1,120.5 | 1,103.4 | 1,087.7 | 1,070.5 | 1,143.5 | 1,103.4 |
| Retained Earnings | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | 4,084.0 | 4,012.0 | 3,909.8 | 3,686.4 | 3,601.9 | 3,505.4 | 3,909.8 | 3,505.4 |
| Net income | 98.4 | 77.5 | 106.7 | 113.9 | 89.2 | 100.6 | ||
| Cash dividends paid on common stock | (5.3) | (5.5) | (4.5) | (4.6) | (4.7) | (4.1) | ||
| Ending balance | 4,177.1 | 4,084.0 | 4,012.0 | 3,795.7 | 3,686.4 | 3,601.9 | 4,177.1 | 3,795.7 |
| Accumulated Other Comprehensive Loss | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | (142.9) | (131.7) | (114.9) | (112.7) | (114.1) | (112.6) | (114.9) | (112.6) |
| Other comprehensive income (loss) | 28.3 | (11.2) | (16.8) | 0.8 | 1.4 | (1.5) | ||
| Ending balance | (114.6) | (142.9) | (131.7) | (111.9) | (112.7) | (114.1) | (114.6) | (111.9) |
| Treasury Stock, at cost | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | (2,554.0) | (2,537.9) | (2,532.5) | (2,512.3) | (2,494.7) | (2,444.7) | (2,532.5) | (2,444.7) |
| Repurchases of common stock | (68.5) | (16.1) | (5.4) | (20.7) | (17.6) | (50.0) | ||
| Ending balance | $ (2,622.5) | $ (2,554.0) | $ (2,537.9) | $ (2,533.0) | $ (2,512.3) | $ (2,494.7) | $ (2,622.5) | $ (2,533.0) |
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate change in value for stock issued during the period as a result of employee stock purchase plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value of stock issued as a result of the exercise of stock options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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