Shareholder's Equity (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||
| Beginning balance (in shares) | 75,300,000 | 75,300,000 | ||||
| Beginning balance | $ 2,990.4 | $ 3,176.0 | $ 2,683.1 | $ 2,682.3 | $ 3,176.0 | $ 2,682.3 |
| Beginning balance (in shares) | 3,300,000 | 3,300,000 | ||||
| Net income | 154.0 | $ 138.8 | 131.8 | 89.8 | $ 292.8 | $ 221.6 |
| Activity related to stock-based compensation | $ 17.7 | 8.8 | $ 12.9 | 7.1 | ||
| Shares purchased under share repurchase program (in shares) | 538,591 | 2,312 | 1,760,610 | 552,593 | ||
| Shares purchased under share repurchase program | $ (156.7) | (297.6) | $ (0.5) | (133.5) | $ (454.3) | $ (134.0) |
| Dividends declared | (15.9) | (15.0) | (15.2) | |||
| Other comprehensive income (loss), net of tax | $ (15.2) | (19.7) | 116.8 | 52.6 | $ (34.9) | 169.4 |
| Ending balance (in shares) | 75,300,000 | 75,300,000 | ||||
| Ending balance | $ 2,990.2 | $ 2,990.4 | $ 2,929.1 | $ 2,683.1 | $ 2,990.2 | $ 2,929.1 |
| Ending balance (in shares) | 4,900,000 | 4,900,000 | ||||
| Dividends declared per share (in dollars per share) | $ 0.22 | $ 0.21 | $ 0.21 | |||
| Common Stock | ||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||
| Beginning balance (in shares) | 75,300,000 | 75,300,000 | 75,300,000 | 75,300,000 | 75,300,000 | 75,300,000 |
| Beginning balance | $ 18.8 | $ 18.8 | $ 18.8 | $ 18.8 | $ 18.8 | $ 18.8 |
| Ending balance (in shares) | 75,300,000 | 75,300,000 | 75,300,000 | 75,300,000 | 75,300,000 | 75,300,000 |
| Ending balance | $ 18.8 | $ 18.8 | $ 18.8 | $ 18.8 | $ 18.8 | $ 18.8 |
| Capital in Excess of Par Value | ||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||
| Beginning balance | 0.0 | 0.0 | 1.8 | 22.1 | 0.0 | 22.1 |
| Activity related to stock-based compensation | (1.8) | (20.3) | ||||
| Ending balance | 0.0 | 0.0 | 0.0 | 1.8 | 0.0 | 0.0 |
| Treasury Stock | ||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||
| Beginning balance | $ (1,379.1) | $ (1,112.2) | $ (1,163.2) | $ (1,057.1) | $ (1,112.2) | $ (1,057.1) |
| Beginning balance (in shares) | 4,400,000 | 3,300,000 | 3,500,000 | 3,000,000.0 | 3,300,000 | 3,000,000.0 |
| Activity related to stock-based compensation (in shares) | (100,000) | (100,000) | (100,000) | (100,000) | ||
| Activity related to stock-based compensation | $ 23.5 | $ 30.7 | $ 23.5 | $ 27.4 | ||
| Shares purchased under share repurchase program (in shares) | 600,000 | 1,200,000 | 600,000 | |||
| Shares purchased under share repurchase program | $ (156.7) | $ (297.6) | (0.5) | $ (133.5) | ||
| Ending balance | $ (1,512.3) | $ (1,379.1) | $ (1,140.2) | $ (1,163.2) | $ (1,512.3) | $ (1,140.2) |
| Ending balance (in shares) | 4,900,000 | 4,400,000 | 3,400,000 | 3,500,000 | 4,900,000 | 3,400,000 |
| Retained earnings | ||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||
| Beginning balance | $ 4,475.9 | $ 4,374.9 | $ 4,031.2 | $ 3,956.6 | $ 4,374.9 | $ 3,956.6 |
| Net income | 154.0 | 138.8 | 131.8 | 89.8 | ||
| Activity related to stock-based compensation | (5.8) | (21.9) | (8.8) | |||
| Dividends declared | (15.9) | (15.0) | (15.2) | |||
| Ending balance | 4,624.1 | 4,475.9 | 4,139.2 | 4,031.2 | 4,624.1 | 4,139.2 |
| Accumulated other comprehensive loss | ||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||
| Beginning balance | (125.2) | (105.5) | (205.5) | (258.1) | (105.5) | (258.1) |
| Other comprehensive income (loss), net of tax | (15.2) | (19.7) | 116.8 | 52.6 | ||
| Ending balance | $ (140.4) | $ (125.2) | $ (88.7) | $ (205.5) | $ (140.4) | $ (88.7) |
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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/disclosureRef
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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