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Stock-Based Compensation - Unvested restricted stock and deferred shares activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Disclosures |  |  |
Total unrecognized compensation cost related to the unvested awards | $ 14.1 |  |
Total weighted average remaining term of unvested awards | 1 year 5 months 19 days |  |
Compensation cost recognized | $ 19.5 | $ 20.2 | $ 18.4
Performance stock units |  |  |
Summary of unvested restricted stock and deferred shares activity and related information |  |  |
Unvested at beginning of year (in shares) | 113 | 146 | 178
Granted (in shares) | 79 | 99 | 108
Vested (in shares) | (80) | (125) | (136)
Cancelled/Forfeitures (in shares) | (6) | (7) | (4)
Unvested at end of year (in shares) | 106 | 113 | 146
Weighted Average Grant Date Fair Value |  |  |
Unvested at beginning of period (in dollars per share) | $ 142.53 | $ 107.29 | $ 88.32
Granted (in dollars per share) | 162.23 | 106.37 | 102.98
Vested (in dollars per share) | 122.88 | 73.62 | 78.82
Cancelled/Forfeitures (in dollars per share) | 174.85 | 132.14 | 110.43
Unvested at end of period (in dollars per share) | $ 170.42 | $ 142.53 | $ 107.29
Other Disclosures |  |  |
Total fair value of shares vested | $ 16.6 | $ 21.1 | $ 20.4
Total unrecognized compensation cost related to the unvested awards | $ 8.0 |  |
Total weighted average remaining term of unvested awards | 1 year 6 months 10 days |  |
Compensation cost recognized | $ 7.5 | $ 9.7 | $ 9.8
Aggregate intrinsic value of outstanding awards | $ 21.6 |  |
Performance stock units | Class A |  |  |
Other Disclosures |  |  |
Company's closing Common Stock price (in dollars per share) | $ 203.3 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock and deferred shares |  |  |
Summary of unvested restricted stock and deferred shares activity and related information |  |  |
Unvested at beginning of year (in shares) | 93 | 121 | 138
Granted (in shares) | 44 | 51 | 64
Vested (in shares) | (47) | (76) | (78)
Cancelled/Forfeitures (in shares) | (4) | (3) | (3)
Unvested at end of year (in shares) | 86 | 93 | 121
Weighted Average Grant Date Fair Value |  |  |
Unvested at beginning of period (in dollars per share) | $ 149.96 | $ 121.39 | $ 97.43
Granted (in dollars per share) | 202.03 | 167.39 | 143.86
Vested (in dollars per share) | 144.02 | 112.65 | 94.33
Cancelled/Forfeitures (in dollars per share) | 169.9 | 139.46 | 120.31
Unvested at end of period (in dollars per share) | $ 179.08 | $ 149.96 | $ 121.39
Other Disclosures |  |  |
Total fair value of shares vested | $ 10.8 | $ 12.7 | $ 11.1
Total unrecognized compensation cost related to the unvested awards | $ 4.5 |  |
Total weighted average remaining term of unvested awards | 1 year 4 months 24 days |  |
Compensation cost recognized | $ 10.7 | $ 9.3 | $ 7.7
Aggregate intrinsic value of outstanding awards | $ 17.6 |  |
Second Amended and Restated 2004 Stock Incentive Plan | Restricted stock and deferred shares | Class A |  |  |
Other Disclosures |  |  |
Company's closing Common Stock price (in dollars per share) | $ 203.3 |  |
Management Stock Purchase Plan | Restricted stock | Class A |  |  |
Other Disclosures |  |  |
Company's closing Common Stock price (in dollars per share) | $ 203.3 |  |
Management Stock Purchase Plan | Restricted stock units (RSUs) |  |  |
Summary of unvested restricted stock and deferred shares activity and related information |  |  |
Granted (in shares) | 20 | 26 | 29
Cancelled/Forfeitures (in shares) | (2) | (1) | (2)
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) | $ 68.94 | $ 57.5 | $ 47.26
Other Disclosures |  |  |
Total unrecognized compensation cost related to the unvested awards | $ 1.7 |  |
Total weighted average remaining term of unvested awards | 1 year 4 months 24 days |  |
Compensation cost recognized | $ 1.3 | $ 1.2 | $ 0.9
Aggregate intrinsic value of outstanding awards | 5.1 |  |
Dividend declared and unpaid | $ 0.1 |  |

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