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Employee Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Option Outstanding | 25,000 | 57,000 |
Options granted | 0 | 0 | 0
Options vested | 0 | 0 | 0
Intrinsic value option exercised | $ 5.4 | $ 9.0 | $ 3.6
Stock compensation expense | 63.1 | 48.5 | 31.3
Recognized excess tax benefits for stock options exercised | 27.6 | 16.3 | 16.2
Total unrecognized compensation cost | $ 64.6 |  |
Expected weighted average recognition period | 1 year 10 months 24 days |  |
2014 Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of shares reserved for share based compensation award | 15,100,000 |  |
Shares available for issuance | 7,600,000 |  |
Number of additional shares available for future issuance | 400,000 |  |
2014 Incentive Plan | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock award granted vested period | 3 years |  |
2014 Incentive Plan | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock award granted vested period | 4 years |  |
2014 Incentive Plan | Cliff Vest | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock award granted vested period | 3 years |  |
2014 Incentive Plan | Cliff Vest | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock award granted vested period | 4 years |  |
2007 Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares available for issuance | 0 |  |
Option Outstanding | 0 |  |
2005 Equity Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares available for issuance | 0 |  |
Option Outstanding | 0 |  |
1998 Stock Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares available for issuance | 0 |  |
Option Outstanding | 0 |  |
Stock Options and SARS | 2014 Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted term | 10 years |  |
Restricted Stock Units (RSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total fair value of restricted stock/unit | $ 53.6 | $ 37.6 | $ 29.0
Restricted Stock Units (RSUs) | 2014 Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
RSUs Outstanding | 1,000,000 |  |
Service Condition Based Restricted Stock Unit Grants |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
RSUs Outstanding | 636,000 | 1,118,000 |
Weighted average grant date fair value, granted | $ 186.61 | $ 87.05 | $ 62.46
Performance Market and Service Condition Based Restricted Stock Unit Grants |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
RSUs Outstanding | 358,000 | 406,000 |
Weighted average grant date fair value, granted | $ 201.97 | $ 88.48 | $ 70.77
Performance Market and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock award granted vested period | 3 years |  |
Increased or decreased percentage of total number of shares of additional common stock earned | 10.00% |  |
Performance Market and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of number of shares of common stock earned | 0.00% |  |
Performance Market and Service Condition Based Restricted Stock Unit Grants | 2014 Incentive Plan | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of number of shares of common stock earned | 200.00% |  |

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