Stockholders' Equity - Roll Forward (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | $ 1,659.1 | $ 1,606.8 | $ 1,603.3 | $ 1,564.4 | $ 1,548.0 | $ 1,586.8 | $ 1,603.3 | $ 1,586.8 |
| Total comprehensive income | 76.8 | 110.8 | 57.3 | 53.1 | 55.4 | 43.4 | 244.9 | 151.9 |
| Stock-based compensation expense | 10.6 | 9.2 | 11.7 | 9.6 | 9.0 | 10.5 | ||
| Proceeds from exercise of stock options and ESPP contributions | 0.9 | 1.0 | 2.5 | 5.0 | 1.3 | 1.1 | ||
| Taxes withheld and paid on employees' share-based payment awards | (0.1) | (0.5) | ||||||
| Repurchase of common stock | (35.4) | (50.1) | (50.0) | (25.0) | (32.9) | (78.0) | ||
| Common stock dividends | (18.5) | (18.6) | (18.0) | (15.5) | (16.4) | (15.3) | ||
| Ending balance | $ 1,693.5 | $ 1,659.1 | $ 1,606.8 | $ 1,591.5 | $ 1,564.4 | $ 1,548.0 | $ 1,693.5 | $ 1,591.5 |
| Common stock dividend declared (in dollars per share) | $ 0.11 | $ 0.11 | $ 0.11 | $ 0.09 | $ 0.09 | $ 0.09 | ||
| Common stock issued (in shares) | 52,043 | 383,590 | 1,210,313 | 981,523 | ||||
| Common Stock | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | $ 1.7 | $ 1.7 | $ 1.7 | $ 1.7 | $ 1.7 | $ 1.7 | $ 1.7 | $ 1.7 |
| Ending balance | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 |
| Additional paid-in capital | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | 2,797.8 | 2,806.2 | 2,810.0 | 2,817.9 | 2,824.0 | 2,828.2 | 2,810.0 | 2,828.2 |
| Stock-based compensation expense | 10.6 | 9.2 | 11.7 | 9.6 | 9.0 | 10.5 | ||
| Proceeds from exercise of stock options and ESPP contributions | 0.9 | 1.0 | 2.5 | 5.0 | 1.3 | 1.1 | ||
| Taxes withheld and paid on employees' share-based payment awards | (0.1) | (0.5) | ||||||
| Common stock dividends | (18.5) | (18.6) | (18.0) | (15.5) | (16.4) | (15.3) | ||
| Ending balance | 2,790.8 | 2,797.8 | 2,806.2 | 2,816.9 | 2,817.9 | 2,824.0 | 2,790.8 | 2,816.9 |
| Retained deficit | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | (1,059.6) | (1,122.8) | (1,131.7) | (1,185.5) | (1,203.1) | (1,168.7) | (1,131.7) | (1,168.7) |
| Total comprehensive income | 76.3 | 113.3 | 58.9 | 61.8 | 50.5 | 43.6 | ||
| Repurchase of common stock | (35.4) | (50.1) | (50.0) | (25.0) | (32.9) | (78.0) | ||
| Ending balance | (1,018.7) | (1,059.6) | (1,122.8) | (1,148.7) | (1,185.5) | (1,203.1) | (1,018.7) | (1,148.7) |
| Accumulated other comprehensive loss | ||||||||
| Increase (Decrease) in Stockholders' Equity [Roll Forward] | ||||||||
| Beginning balance | (80.8) | (78.3) | (76.7) | (69.7) | (74.6) | (74.4) | (76.7) | (74.4) |
| Total comprehensive income | 0.5 | (2.5) | (1.6) | (8.7) | 4.9 | (0.2) | ||
| Ending balance | $ (80.3) | $ (80.8) | $ (78.3) | $ (78.4) | $ (69.7) | $ (74.6) | $ (80.3) | $ (78.4) |
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- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from dividends legally declared (or paid) in excess of retained earnings balance. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 Number of new stock issued during the period. 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 Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). 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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