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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | $ 8,076.4 | $ 6,851.9 | $ 7,056.4
Reimbursements | 133.0 | 151.7 | 138.6
Total revenues | 8,209.4 | 7,003.6 | 7,195.0
Compensation | 3,927.5 | 3,466.5 | 3,339.5
Operating | 1,072.4 | 906.5 | 1,068.5
Reimbursements | 133.0 | 151.7 | 138.6
Cost of revenues from clean coal activities | 1,173.2 | 882.1 | 1,352.8
Interest | 226.1 | 196.4 | 179.8
Loss on extinguishment of debt | 16.2 |  |
Depreciation | 151.2 | 145.1 | 140.4
Amortization | 415.1 | 417.3 | 334.0
Change in estimated acquisition earnout payables | 119.6 | (32.9) | 15.3
Total expenses | 7,234.3 | 6,132.7 | 6,568.9
Earnings (loss) before income taxes | 975.1 | 870.9 | 626.1
Provision (benefit) for income taxes | 20.1 | 12.8 | (89.7)
Net earnings (loss) | 955.0 | 858.1 | 715.8
Net earnings attributable to noncontrolling interests | 48.2 | 39.3 | 47.0
Net earnings (loss) attributable to controlling interests | 906.8 | 818.8 | 668.8
Net foreign exchange (loss) gain | (2.3) | (2.9) | (6.7)
Total identifiable assets | 33,345.0 | 22,331.4 | 19,634.8
Goodwill - net | 8,666.2 | 6,127.0 | 5,618.5
Amortizable intangible assets - net | 3,954.0 | 2,399.9 | 2,318.7
Unites States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 5,856.8 | 5,048.9 | 5,379.1
Total identifiable assets | 18,828.6 | 11,786.3 | 10,782.7
Goodwill - net | 4,473.9 | 3,433.0 |
United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,245.0 | 1,034.4 | 963.4
Total identifiable assets | 8,385.4 | 6,274.3 | 5,091.1
Goodwill - net | 2,213.7 | 1,343.4 |
Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 376.1 | 314.5 | 298.6
Total identifiable assets | 1,768.9 | 1,462.9 | 1,307.9
Goodwill - net | 498.1 | 473.6 |
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 308.0 | 249.1 | 226.0
Total identifiable assets | 1,440.5 | 1,058.4 | 916.7
Goodwill - net | 572.9 | 492.9 |
New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 177.0 | 154.4 | 160.8
Total identifiable assets | 775.0 | 790.1 | 718.7
Goodwill - net | 227.8 | 232.6 |
Other Foreign [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 246.5 | 202.3 | 167.1
Total identifiable assets | 2,146.6 | 959.4 | 817.7
Goodwill - net | 679.8 | 151.5 |
Commissions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 4,132.3 | 3,591.9 | 3,320.6
Broker Fees [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 2,264.1 | 1,957.9 | 1,911.1
Supplemental Revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 248.7 | 221.9 | 210.5
Contingent Revenue [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 188.0 | 147.0 | 135.6
Investment income [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 83.1 | 75.9 | 86.9
Net (Losses) Gains on Divestitures [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 18.9 | (5.8) | 75.3
Clean Coal Activities [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 1,140.8 | 863.5 | 1,319.3
Other Net Revenue (Losses) [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 0.5 | (0.4) | (2.9)
Brokerage [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 8,544.6 | 6,053.6 | 5,548.9
Brokerage [Member] | Unites States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 4,409.1 | 3,399.8 |
Brokerage [Member] | United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 2,198.7 | 1,328.3 |
Brokerage [Member] | Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 487.2 | 462.1 |
Brokerage [Member] | Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 572.9 | 492.9 |
Brokerage [Member] | New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 217.6 | 221.9 |
Brokerage [Member] | Other Foreign [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 659.1 | 148.6 |
Brokerage [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 5,967.5 | 5,167.1 | 4,901.5
Total revenues | 5,967.5 | 5,167.1 | 4,901.5
Compensation | 3,252.4 | 2,882.5 | 2,745.9
Operating | 757.9 | 687.2 | 796.5
Depreciation | 87.8 | 73.5 | 66.6
Amortization | 407.6 | 411.3 | 329.1
Change in estimated acquisition earnout payables | 116.3 | (29.7) | 16.9
Total expenses | 4,622.0 | 4,024.8 | 3,955.0
Earnings (loss) before income taxes | 1,345.5 | 1,142.3 | 946.5
Provision (benefit) for income taxes | 328.9 | 276.3 | 229.2
Net earnings (loss) | 1,016.6 | 866.0 | 717.3
Net earnings attributable to noncontrolling interests | 8.4 | 4.9 | 17.2
Net earnings (loss) attributable to controlling interests | 1,008.2 | 861.1 | 700.1
Net foreign exchange (loss) gain | (1.7) | (2.6) | (1.0)
Total identifiable assets | 29,821.0 | 19,185.3 | 16,741.9
Goodwill - net | 8,544.6 | 6,053.6 | 5,548.9
Amortizable intangible assets - net | 3,906.1 | 2,376.3 | 2,289.9
Brokerage [Member] | Operating Segments [Member] | Unites States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,804.8 | 3,369.4 | 3,234.3
Total identifiable assets | 15,548.3 | 8,897.9 | 8,132.3
Brokerage [Member] | Operating Segments [Member] | United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,199.0 | 993.7 | 921.8
Total identifiable assets | 8,251.3 | 6,135.1 | 4,964.5
Brokerage [Member] | Operating Segments [Member] | Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 252.6 | 216.1 | 211.3
Total identifiable assets | 1,684.2 | 1,373.3 | 1,217.9
Brokerage [Member] | Operating Segments [Member] | Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 302.2 | 243.8 | 221.4
Total identifiable assets | 1,436.1 | 1,053.6 | 913.6
Brokerage [Member] | Operating Segments [Member] | New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 162.4 | 141.8 | 145.6
Total identifiable assets | 754.5 | 766.0 | 695.9
Brokerage [Member] | Operating Segments [Member] | Other Foreign [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 246.5 | 202.3 | 167.1
Total identifiable assets | 2,146.6 | 959.4 | 817.7
Brokerage [Member] | Commissions [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 4,132.3 | 3,591.9 | 3,320.6
Brokerage [Member] | Broker Fees [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 1,296.9 | 1,136.9 | 1,074.2
Brokerage [Member] | Supplemental Revenue [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 248.7 | 221.9 | 210.5
Brokerage [Member] | Contingent Revenue [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 188.0 | 147.0 | 135.6
Brokerage [Member] | Investment income [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 82.8 | 75.2 | 85.3
Brokerage [Member] | Net (Losses) Gains on Divestitures [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 18.8 | (5.8) | 75.3
Risk Management [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 100.9 | 70.5 | 66.6
Risk Management [Member] | Unites States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 64.8 | 33.2 |
Risk Management [Member] | United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 15.0 | 15.1 |
Risk Management [Member] | Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 10.9 | 11.5 |
Risk Management [Member] | New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 10.2 | 10.7 |
Risk Management [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 967.6 | 821.7 | 838.5
Reimbursements | 133.0 | 151.7 | 138.6
Total revenues | 1,100.6 | 973.4 | 977.1
Compensation | 580.7 | 517.5 | 515.7
Operating | 209.8 | 162.6 | 184.9
Reimbursements | 133.0 | 151.7 | 138.6
Depreciation | 46.2 | 49.4 | 46.2
Amortization | 7.5 | 6.0 | 4.9
Change in estimated acquisition earnout payables | 3.3 | (3.2) | (1.6)
Total expenses | 980.5 | 884.0 | 888.7
Earnings (loss) before income taxes | 120.1 | 89.4 | 88.4
Provision (benefit) for income taxes | 30.6 | 22.5 | 22.2
Net earnings (loss) | 89.5 | 66.9 | 66.2
Net earnings (loss) attributable to controlling interests | 89.5 | 66.9 | 66.2
Net foreign exchange (loss) gain |  | (0.1) | (0.1)
Total identifiable assets | 1,034.4 | 973.9 | 898.1
Goodwill - net | 100.9 | 70.5 | 66.6
Amortizable intangible assets - net | 47.9 | 23.6 | 28.8
Risk Management [Member] | Operating Segments [Member] | Unites States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 910.7 | 816.4 | 828.4
Total identifiable assets | 790.7 | 716.2 | 655.6
Risk Management [Member] | Operating Segments [Member] | United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 46.0 | 40.7 | 41.6
Total identifiable assets | 134.1 | 139.2 | 126.6
Risk Management [Member] | Operating Segments [Member] | Australia [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 123.5 | 98.4 | 87.3
Total identifiable assets | 84.7 | 89.6 | 90.0
Risk Management [Member] | Operating Segments [Member] | Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 5.8 | 5.3 | 4.6
Total identifiable assets | 4.4 | 4.8 | 3.1
Risk Management [Member] | Operating Segments [Member] | New Zealand [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 14.6 | 12.6 | 15.2
Total identifiable assets | 20.5 | 24.1 | 22.8
Risk Management [Member] | Broker Fees [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 967.2 | 821.0 | 836.9
Risk Management [Member] | Investment income [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 0.3 | 0.7 | 1.6
Risk Management [Member] | Net (Losses) Gains on Divestitures [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 0.1 |  |
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 20.7 | 2.9 | 3.0
Corporate [Member] | Other Foreign [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill - net | 20.7 | 2.9 |
Corporate [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 1,141.3 | 863.1 | 1,316.4
Total revenues | 1,141.3 | 863.1 | 1,316.4
Compensation | 94.4 | 66.5 | 77.9
Operating | 104.7 | 56.7 | 87.1
Cost of revenues from clean coal activities | 1,173.2 | 882.1 | 1,352.8
Interest | 226.1 | 196.4 | 179.8
Loss on extinguishment of debt | 16.2 |  |
Depreciation | 17.2 | 22.2 | 27.6
Total expenses | 1,631.8 | 1,223.9 | 1,725.2
Earnings (loss) before income taxes | (490.5) | (360.8) | (408.8)
Provision (benefit) for income taxes | (339.4) | (286.0) | (341.1)
Net earnings (loss) | (151.1) | (74.8) | (67.7)
Net earnings attributable to noncontrolling interests | 39.8 | 34.4 | 29.8
Net earnings (loss) attributable to controlling interests | (190.9) | (109.2) | (97.5)
Net foreign exchange (loss) gain | (0.6) | (0.2) | (5.6)
Total identifiable assets | 2,489.6 | 2,172.2 | 1,994.8
Goodwill - net | 20.7 | 2.9 | 3.0
Corporate [Member] | Operating Segments [Member] | Unites States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,141.3 | 863.1 | 1,316.4
Total identifiable assets | 2,489.6 | 2,172.2 | 1,994.8
Corporate [Member] | Clean Coal Activities [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | 1,140.8 | 863.5 | 1,319.3
Corporate [Member] | Other Net Revenue (Losses) [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues before reimbursements | $ 0.5 | $ (0.4) | $ (2.9)

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