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Stock-Based Compensation - Fair Value Assumptions (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) item $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares
Additional information |  |  |
Stock-based compensation expense | $ 21.8 | $ 16.6 | $ 12.9
Restricted Stock Units (RSUs) |  |  |
Other information |  |  |
Compensation expense yet to be recognized | $ 4.8 |  |
Weighted-average period over which compensation cost will be recognized | 1 year 4 months 24 days |  |
Shares |  |  |
Unvested at beginning of year (in shares) | shares | 79 |  |
Granted (in shares) | shares | 24 |  |
Vested (in shares) | shares | (45) |  |
Unvested at end of year (in shares) | shares | 58 | 79 |
Weighted Average Grant Date Fair Value |  |  |
Unvested at beginning of year (in dollars per share) | $ / shares | $ 187.33 |  |
Granted (in dollars per share) | $ / shares | 378.49 | $ 315.04 | $ 164.47
Vested (in dollars per share) | $ / shares | 185.65 |  |
Unvested at end of year (in dollars per share) | $ / shares | 269.97 | 187.33 |
Additional information |  |  |
Weighted-average fair value (in dollars per share) | $ / shares | $ 378.49 | $ 315.04 | $ 164.47
Aggregate intrinsic value of restricted stock vested | $ 20.9 | $ 19.8 | $ 9.3
Performance Stock Units |  |  |
Other information |  |  |
Compensation expense yet to be recognized | $ 3.3 |  |
Weighted-average period over which compensation cost will be recognized | 1 year |  |
Additional information |  |  |
Fair value of shares vested | $ 6.6 | 5.4 | 4.5
Vesting period | 3 years |  |
Types of performance units | item | 2 |  |
Percentage of units measured on stock price relative to peer group | 50.00% |  |
Percentage of units measured on stock price based on pre determined EPS | 50.00% |  |
Period for which shareholder return is compared with peer group for units determined by EPS performance | 3 years |  |
Calculated fair market value | $ 22.9 |  |
Value of PSUs granted | 8.0 |  |
Stock-based compensation expense | $ 10.9 | $ 7.8 | $ 6.6
Performance Stock Units | Minimum |  |  |
Additional information |  |  |
Performance measures for dollar denominated award granted | 0 |  |
Performance Stock Units | Maximum |  |  |
Additional information |  |  |
Performance measures for dollar denominated award granted | 2 |  |
2025 PSU Grant |  |  |
Fair value assumptions: |  |  |
Risk-free interest rate | 3.40% |  |
Dividend yield | 0.30% |  |
Volatility | 53.70% |  |
Look-back period (in years) | 2 years |  |
2024 PSU Grant |  |  |
Fair value assumptions: |  |  |
Risk-free interest rate | 3.50% | 4.20% |
Dividend yield | 0.30% | 0.30% |
Volatility | 61.40% | 40.20% |
Look-back period (in years) | 1 year | 2 years |
2023 PSU Grant |  |  |
Fair value assumptions: |  |  |
Risk-free interest rate |  | 4.10% | 4.20%
Dividend yield |  | 0.30% | 0.50%
Volatility |  | 44.90% | 35.00%
Look-back period (in years) |  | 1 year | 2 years
2022 PSU Grant |  |  |
Fair value assumptions: |  |  |
Risk-free interest rate |  |  | 4.70%
Dividend yield |  |  | 0.50%
Volatility |  |  | 35.10%
Look-back period (in years) |  |  | 1 year

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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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