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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 1,933.5 | $ 1,584.0 | $ 4,098.5 | $ 3,450.9 |
Earnings before income taxes | 222.3 | 171.7 | 630.7 | 527.7 |
Identifiable assets at June 30, 2021 and 2020 | 27,817.2 | 21,306.2 | 27,817.2 | 21,306.2 | $ 22,331.4
Operating Segments [Member] | Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 1,390.2 | 1,201.1 | 3,000.4 | 2,636.7 |
Earnings before income taxes | 299.7 | 247.8 | 780.0 | 658.6 |
Identifiable assets at June 30, 2021 and 2020 | 21,858.6 | 18,405.6 | 21,858.6 | 18,405.6 |
Operating Segments [Member] | Risk Management [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 281.7 | 223.2 | 534.4 | 472.7 |
Earnings before income taxes | 33.4 | 13.2 | 57.5 | 38.8 |
Identifiable assets at June 30, 2021 and 2020 | 1,058.5 | 929.1 | 1,058.5 | 929.1 |
Operating Segments [Member] | Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 261.6 | 159.7 | 563.7 | 341.5 |
Earnings before income taxes | (110.8) | (89.3) | (206.8) | (169.7) |
Identifiable assets at June 30, 2021 and 2020 | $ 4,900.1 | $ 1,971.5 | $ 4,900.1 | $ 1,971.5 |

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