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Stock-Based Compensation - Stock Award Information and Fair Value Assumptions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Stock-based compensation |  |  |
Unrecognized compensation cost related to stock options | $ 34.7 |  |
Stock-based compensation expense |  |  |
Total stock-based compensation cost | 32.8 | $ 31.5 | $ 25.7
Capitalized cost during the period | (3.3) | (4.5) | (1.9)
Amortization of capitalized cost during the period | 3.4 | 4.7 | 1.2
Total stock-based compensation expense | 32.9 | 31.7 | 25.0
Income tax benefit | 18.7 | $ 11.4 | $ 11.5
Unrecognized compensation cost related to awards other than options | $ 34.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards | 1 year 2 months 12 days |  |
Executive Incentive Program |  |  |
Stock-based compensation |  |  |
Shares available for grant under the plan (in shares) | 2,800 |  |
Restricted shares, performance shares, or other full value awards | Executive Incentive Program |  |  |
Stock-based compensation |  |  |
Shares available for grant under the plan (in shares) | 800 |  |
Stock options - annual equity grant |  |  |
Stock-based compensation |  |  |
Stock options granted (in shares) | 117 |  |
Weighted-average assumptions used to estimate grant date fair value of stock options |  |  |
Expected dividend yield (as a percent) | 1.20% | 1.20% | 0.90%
Expected life in years | 4 years 8 months 12 days | 4 years 7 months 6 days | 4 years 8 months 12 days
Expected volatility (as a percent) | 32.10% | 32.40% | 29.10%
Risk-free interest rate (as a percent) | 3.90% | 3.60% | 1.80%
Weighted average grant date fair value (in dollars per share) | $ 97.11 | $ 74.20 | $ 55.96
Fair value of equity awards granted | $ 11.4 | $ 13.3 | $ 12.8
Restricted stock awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 36 |  |
Unrecognized compensation cost related to stock options | $ 9.1 |  |
Stock-based compensation expense |  |  |
Total stock-based compensation cost | $ 9.4 | 8.3 | 7.2
Vesting period | 3 years |  |
Unrecognized compensation cost related to awards other than options | $ 9.1 |  |
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards | 1 year 8 months 12 days |  |
Performance share awards |  |  |
Stock-based compensation |  |  |
Awards granted (in shares) | 24 |  |
Unrecognized compensation cost related to stock options | $ 10.7 |  |
Stock-based compensation expense |  |  |
Total stock-based compensation cost | $ 9.4 | 8.8 | 8.3
Vesting period | 3 years |  |
Unrecognized compensation cost related to awards other than options | $ 10.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards | 1 year 8 months 12 days |  |
Q2 2022 Stock Option and Stock Appreciation Right Grant |  |  |
Stock-based compensation expense |  |  |
Total stock-based compensation cost | $ 5.0 | 6.7 | 2.9
Capitalized cost during the period | $ (0.4) | (0.5) | (0.7)
Stock option awards |  |  |
Stock-based compensation |  |  |
Stock options granted (in shares) | 117 |  |
Unrecognized compensation cost related to stock options | $ 11.1 |  |
Stock-based compensation expense |  |  |
Total stock-based compensation cost | $ 14.0 | $ 14.4 | $ 10.2
Vesting period | 3 years |  |
Maximum term life | 10 years |  |
Unrecognized compensation cost related to awards other than options | $ 11.1 |  |
2022 Broad-based Grant |  |  |
Weighted-average assumptions used to estimate grant date fair value of stock options |  |  |
Expected dividend yield (as a percent) |  |  | 1.00%
Expected life in years |  |  | 3 years 9 months 18 days
Expected volatility (as a percent) |  |  | 31.90%
Risk-free interest rate (as a percent) |  |  | 3.90%
Weighted average grant date fair value (in dollars per share) |  |  | $ 80.23
Fair value of equity awards granted |  |  | $ 40.4

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