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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] | In accordance with the SEC’s disclosure requirements regarding pay versus performance (“PVP”), this section presents the SEC-defined “Compensation Actually Paid” (“CAP”). Also required by SEC’s new PVP rules, this section compares CAP to various measures used to gauge our performance. Our compensation decisions are made independently of disclosure requirements. CAP is a supplemental measure to be viewed alongside performance measures described under “Compensation Discussion and Analysis,” not in replacement. Pay Versus Performance Table In accordance with the SEC’s new PVP rules, the following table sets forth information concerning the compensation of our Named Executive Officers for each of the fiscal years ended December 31, 2022, 2021 and 2020, and our financial performance for each such fiscal year:
Year |  | Summary Compensation Table Total for CEO ($) |  |  | Compensation Actually Paid to CEO ($) (1) |  |  | Average Summary Compensation Table Total for Non-CEO NEOs ($) |  |  | Average Compensation Actually Paid to Non-CEO NEOs ($) (2) |  |  | Value of Initial Fixed $100 Investment Based on: |  |  | Net Income (in millions) |  |  | Organic Revenue growth rate (4) |
| Total Shareholder Return |  |  | Peer Group Total Shareholder Return (3) |
2022 |  |  | 6,741,633 |  |  |  | (5,295,763 | ) |  |  | 4,728,133 |  |  |  | 2,800,269 |  |  | $ | 147.41 |  |  | $ | 149.06 |  |  | $ | 671.8 |  |  |  | 8.1 | %
2021 |  |  | 9,201,035 |  |  |  | 32,778,563 |  |  |  | 3,508,148 |  |  |  | 6,939,244 |  |  | $ | 180.65 |  |  | $ | 145.28 |  |  | $ | 587.1 |  |  |  | 10.4 | %
2020 |  |  | 7,254,300 |  |  |  | 15,105,043 |  |  |  | 2,573,911 |  |  |  | 4,184,212 |  |  | $ | 121.00 |  |  | $ | 106.20 |  |  | $ | 480.5 |  |  |  | 3.8 | %
(1) | The Compensation Actually Paid to J. Powell Brown, President and Chief Executive Officer of the Company, for each of the fiscal years ended December 31, 2022, 2021 and 2020, is calculated, as follows:
Year |  | Reported summary compensation table total for CEO ($) (a) |  |  | Reported value of equity awards ($) (b) |  |  | Equity award adjustments ($) (c)* |  |  | Reported change in the actuarial present value of pension benefits ($) (d) |  |  | Pension benefit adjustments ($) (e) |  |  | Compensation actually paid to CEO ($) ( a - b + c - d + e ) |
2022 |  |  | 6,741,633 |  |  |  | 2,953,648 |  |  |  | (9,083,748 | ) |  |  | — |  |  |  | — |  |  |  | (5,295,763 | )
2021 |  |  | 9,201,035 |  |  |  | 2,940,017 |  |  |  | 26,517,545 |  |  |  | — |  |  |  | — |  |  |  | 32,778,563 |
2020 |  |  | 7,254,300 |  |  |  | 2,948,008 |  |  |  | 10,798,751 |  |  |  | — |  |  |  | — |  |  |  | 15,105,043 |
| * | The equity award adjustments shown in this column are calculated as follows:
Year |  | Year end fair value of equity awards granted during the year ($) |  |  | Year over year change in fair value of outstanding and unvested equity awards ($) |  |  | Fair value as of vesting date of equity awards granted and vested in the year ($) |  |  | Year over year change in fair value of equity awards granted in prior years that vested in the year ($) |  |  | Fair value at the end of the prior year of equity awards that failed to meet vesting conditions in the year ($) |  |  | Value of dividends or other earnings paid on stock or option awards not otherwise reflected in fair value or total compensation ($) |  |  | Total equity award adjustments ($) |
2022 |  |  | 2,506,468 |  |  |  | (10,904,630 | ) |  |  | — |  |  |  | (685,586 | ) |  |  | — |  |  |  | — |  |  |  | (9,083,748 | )
2021 |  |  | 7,989,712 |  |  |  | 18,728,632 |  |  |  | — |  |  |  | (200,798 | ) |  |  | — |  |  |  | — |  |  |  | 26,517,545 |
2020 |  |  | 4,031,415 |  |  |  | 6,639,119 |  |  |  | — |  |  |  | 128,217 |  |  |  | — |  |  |  | — |  |  |  | 10,798,751 |
| (2) | The average Compensation Actually Paid to our Named Executive Officers, other than J. Powell Brown, President and Chief Executive Officer of the Company, for each of the fiscal years ended December 31, 2022, 2021 and 2020, is calculated, as follows.
Year |  | Average reported summary compensation table total for non-CEO NEOs ($) (a) |  |  | Average reported value of equity awards ($) (b) |  |  | Average equity award adjustments ($) (c)* |  |  | Average reported change in the actuarial present value of pension benefits ($) (d) |  |  | Average pension benefit adjustments ($) (e) |  |  | Average compensation actually paid to non-CEO NEOs ($) (a - b + c - d + e) |
2022 |  |  | 4,728,133 |  |  |  | 2,541,365 |  |  |  | 613,501 |  |  |  | — |  |  |  | — |  |  |  | 2,800,269 |
2021 |  |  | 3,508,148 |  |  |  | 575,709 |  |  |  | 4,006,805 |  |  |  | — |  |  |  | — |  |  |  | 6,939,244 |
2020 |  |  | 2,573,911 |  |  |  | 540,422 |  |  |  | 2,150,723 |  |  |  | — |  |  |  | — |  |  |  | 4,184,212 |
| * | The equity award adjustments shown in this column are calculated as follows:
Year |  | Average year end fair value of equity awards granted during the year ($) |  |  | Average year over year change in fair value of outstanding and unvested equity awards ($) |  |  | Average fair value as of vesting date of equity awards granted and vested in the year ($) |  |  | Average year over year change in fair value of equity awards granted in prior years that vested in the year ($) |  |  | Average fair value at the end of the prior year of equity awards that failed to meet vesting conditions in the year ($) |  |  | Average value of dividends or other earnings paid on stock or option awards not otherwise reflected in fair value or total compensation ($) |  |  | Average total equity award adjustments ($) |
2022 |  |  | 2,080,633 |  |  |  | (1,255,815 | ) |  |  | — |  |  |  | (211,317 | ) |  |  | — |  |  |  | — |  |  |  | 613,501 |
2021 |  |  | 1,564,556 |  |  |  | 2,529,319 |  |  |  | — |  |  |  | (87,070 | ) |  |  | — |  |  |  | — |  |  |  | 4,006,805 |
2020 |  |  | 739,039 |  |  |  | 1,304,049 |  |  |  | — |  |  |  | 107,635 |  |  |  | — |  |  |  | — |  |  |  | 2,150,723 |
| (3) | Peer average among Arthur J. Gallagher & Co, Aon plc, Marsh & McLennan Companies, and Willis Towers Watson Public Limited Company.
| (4) | See Annex A for additional information regarding Organic Revenue growth, which is a non-GAAP financial measure, including a reconciliation to the most closely comparable GAAP financial measure.
Company Selected Measure Name | OrganicRevenuegrowthrate |  |
Named Executive Officers, Footnote [Text Block] | The average Compensation Actually Paid to our Named Executive Officers, other than J. Powell Brown, President and Chief Executive Officer of the Company, for each of the fiscal years ended December 31, 2022, 2021 and 2020, is calculated, as follows. |  |
Peer Group Issuers, Footnote [Text Block] | Peer average among Arthur J. Gallagher & Co, Aon plc, Marsh & McLennan Companies, and Willis Towers Watson Public Limited Company. |  |
PEO Total Compensation Amount | $ 6,741,633 | $ 9,201,035 | $ 7,254,300
PEO Actually Paid Compensation Amount | $ 5,295,763 | 32,778,563 | 15,105,043
Adjustment To PEO Compensation, Footnote [Text Block] |
Year |  | Reported summary compensation table total for CEO ($) (a) |  |  | Reported value of equity awards ($) (b) |  |  | Equity award adjustments ($) (c)* |  |  | Reported change in the actuarial present value of pension benefits ($) (d) |  |  | Pension benefit adjustments ($) (e) |  |  | Compensation actually paid to CEO ($) ( a - b + c - d + e ) |
2022 |  |  | 6,741,633 |  |  |  | 2,953,648 |  |  |  | (9,083,748 | ) |  |  | — |  |  |  | — |  |  |  | (5,295,763 | )
2021 |  |  | 9,201,035 |  |  |  | 2,940,017 |  |  |  | 26,517,545 |  |  |  | — |  |  |  | — |  |  |  | 32,778,563 |
2020 |  |  | 7,254,300 |  |  |  | 2,948,008 |  |  |  | 10,798,751 |  |  |  | — |  |  |  | — |  |  |  | 15,105,043 |
| * | The equity award adjustments shown in this column are calculated as follows:
Year |  | Year end fair value of equity awards granted during the year ($) |  |  | Year over year change in fair value of outstanding and unvested equity awards ($) |  |  | Fair value as of vesting date of equity awards granted and vested in the year ($) |  |  | Year over year change in fair value of equity awards granted in prior years that vested in the year ($) |  |  | Fair value at the end of the prior year of equity awards that failed to meet vesting conditions in the year ($) |  |  | Value of dividends or other earnings paid on stock or option awards not otherwise reflected in fair value or total compensation ($) |  |  | Total equity award adjustments ($) |
2022 |  |  | 2,506,468 |  |  |  | (10,904,630 | ) |  |  | — |  |  |  | (685,586 | ) |  |  | — |  |  |  | — |  |  |  | (9,083,748 | )
2021 |  |  | 7,989,712 |  |  |  | 18,728,632 |  |  |  | — |  |  |  | (200,798 | ) |  |  | — |  |  |  | — |  |  |  | 26,517,545 |
2020 |  |  | 4,031,415 |  |  |  | 6,639,119 |  |  |  | — |  |  |  | 128,217 |  |  |  | — |  |  |  | — |  |  |  | 10,798,751 |
Non-PEO NEO Average Total Compensation Amount | $ 4,728,133 | 3,508,148 | 2,573,911
Non-PEO NEO Average Compensation Actually Paid Amount | $ 2,800,269 | 6,939,244 | 4,184,212
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] |
Year |  | Average reported summary compensation table total for non-CEO NEOs ($) (a) |  |  | Average reported value of equity awards ($) (b) |  |  | Average equity award adjustments ($) (c)* |  |  | Average reported change in the actuarial present value of pension benefits ($) (d) |  |  | Average pension benefit adjustments ($) (e) |  |  | Average compensation actually paid to non-CEO NEOs ($) (a - b + c - d + e) |
2022 |  |  | 4,728,133 |  |  |  | 2,541,365 |  |  |  | 613,501 |  |  |  | — |  |  |  | — |  |  |  | 2,800,269 |
2021 |  |  | 3,508,148 |  |  |  | 575,709 |  |  |  | 4,006,805 |  |  |  | — |  |  |  | — |  |  |  | 6,939,244 |
2020 |  |  | 2,573,911 |  |  |  | 540,422 |  |  |  | 2,150,723 |  |  |  | — |  |  |  | — |  |  |  | 4,184,212 |
| * | The equity award adjustments shown in this column are calculated as follows:
Year |  | Average year end fair value of equity awards granted during the year ($) |  |  | Average year over year change in fair value of outstanding and unvested equity awards ($) |  |  | Average fair value as of vesting date of equity awards granted and vested in the year ($) |  |  | Average year over year change in fair value of equity awards granted in prior years that vested in the year ($) |  |  | Average fair value at the end of the prior year of equity awards that failed to meet vesting conditions in the year ($) |  |  | Average value of dividends or other earnings paid on stock or option awards not otherwise reflected in fair value or total compensation ($) |  |  | Average total equity award adjustments ($) |
2022 |  |  | 2,080,633 |  |  |  | (1,255,815 | ) |  |  | — |  |  |  | (211,317 | ) |  |  | — |  |  |  | — |  |  |  | 613,501 |
2021 |  |  | 1,564,556 |  |  |  | 2,529,319 |  |  |  | — |  |  |  | (87,070 | ) |  |  | — |  |  |  | — |  |  |  | 4,006,805 |
2020 |  |  | 739,039 |  |  |  | 1,304,049 |  |  |  | — |  |  |  | 107,635 |  |  |  | — |  |  |  | — |  |  |  | 2,150,723 |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] |  |  |
Compensation Actually Paid vs. Net Income [Text Block] |  |  |
Tabular List [Table Text Block] | In accordance with the SEC’s new PVP rules, the following tabular list sets forth the financial performance measures the Company has determined are the most important financial performance measures used to link compensation actually paid to Company performance during the last fiscal year:
Financial Performance Measure |  |
Organic Revenue (1) growth rate |  |
Adjusted EBITDAC Margin (1) |  |
Adjusted EPS (1) |  |
Total Shareholder Return (2) |  |
(1) | For additional information related to how we link our executive compensation programs to Adjusted EBITDAC Margin, Organic Revenue growth and Adjusted EPS, see “Compensation Discussion and Analysis.”
(2) | While Total Shareholder Return is not used as one of the metrics tied to the payouts under our incentive plans, the actual value realized under our equity incentive awards is based upon the Company’s Total Shareholder Return (i.e., stock price and dividends paid) over the applicable performance and vesting periods.
Total Shareholder Return Amount | $ 147.41 | 180.65 | 121
Peer Group Total Shareholder Return Amount | 149.06 | 145.28 | 106.2
Net Income (Loss) | $ 671,800,000 | $ 587,100,000 | $ 480,500,000
Company Selected Measure Amount | 8.1 | 10.4 | 3.8
PEO Name | J. Powell Brown |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Organic Revenue growth rate |  |
Non-GAAP Measure Description [Text Block] | See Annex A for additional information regarding Organic Revenue growth, which is a non-GAAP financial measure, including a reconciliation to the most closely comparable GAAP financial measure. |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Adjusted EBITDAC Margin |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Adjusted EPS |  |
Measure [Axis]: 4 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Total Shareholder Return |  |
PEO [Member] | Equity Awards [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 2,953,648 | $ 2,940,017 | $ 2,948,008
PEO [Member] | Equity award adjustments [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 9,083,748 | 26,517,545 | 10,798,751
Fair Value of Equity Awards Granted | 2,506,468 | 7,989,712 | 4,031,415
Change in Fair Value of Outstanding and Unvested Equity Awards | 10,904,630 | 18,728,632 | 6,639,119
Change in Fair Value of Equity Awards Granted in Prior Years that Vested | 685,586 | 200,798 | 128,217
Non-PEO NEO [Member] | Equity Awards [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 2,541,365 | 575,709 | 540,422
Non-PEO NEO [Member] | Equity award adjustments [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 613,501 | 4,006,805 | 2,150,723
Fair Value of Equity Awards Granted | 2,080,633 | 1,564,556 | 739,039
Change in Fair Value of Outstanding and Unvested Equity Awards | 1,255,815 | 2,529,319 | 1,304,049
Change in Fair Value of Equity Awards Granted in Prior Years that Vested | $ 211,317 | $ 87,070 | $ 107,635

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