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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Commissions                 $ 2,627.1 $ 2,439.1 $ 2,338.7
Fees                 1,636.8 1,492.8 1,432.3
Supplemental revenues                 163.7 147.0 125.5
Contingent revenues                 111.8 107.2 93.7
Investment income                 56.3 53.3 54.2
Gains on books of business sales and other                 3.4 6.6 6.7
Revenue from clean coal activities                 1,560.5 1,350.1 1,310.8
Other - net gain                   (1.3) 30.5
Total revenues $ 1,599.0 $ 1,584.5 $ 1,563.4 $ 1,412.7 $ 1,385.0 $ 1,482.3 $ 1,427.1 $ 1,300.4 6,159.6 5,594.8 5,392.4
Compensation                 2,752.3 2,538.9 2,428.9
Operating                 852.5 797.7 840.7
Cost of revenues from clean coal activities                 1,635.9 1,408.6 1,351.5
Interest                 124.1 109.8 103.0
Depreciation                 121.1 103.6 93.9
Amortization                 264.7 247.2 240.3
Change in estimated acquisition earnout payables                 30.9 32.1 40.6
Total expenses                 5,781.5 5,237.9 5,098.9
Earnings (loss) before income taxes                 378.1 356.9 293.5
Provision (benefit) for income taxes                 (121.1) (88.1) (95.6)
Net earnings                 499.2 445.0 389.1
Net earnings attributable to noncontrolling interests                 36.1 30.6 32.3
Net earnings attributable to controlling interests 105.1 130.4 171.9 55.7 95.1 122.8 150.0 46.5 463.1 414.4 356.8
Net foreign exchange gain (loss)                 (2.8) 3.0 0.2
Total revenues 1,599.0 $ 1,584.5 $ 1,563.4 $ 1,412.7 1,385.0 $ 1,482.3 $ 1,427.1 $ 1,300.4 6,159.6 5,594.8 5,392.4
Total assets 12,897.4       11,489.6       12,897.4 11,489.6 10,913.8
Goodwill - net 4,197.9       3,767.8       4,197.9 3,767.8 3,662.9
Amortizable intangible assets - net 1,644.6       1,627.3       1,644.6 1,627.3 1,698.8
Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 4,152.3       3,736.9       4,152.3 3,736.9 3,635.6
Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 42.6       28.1       42.6 28.1 27.3
Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 3.0       2.8       3.0 2.8  
Unites States [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 4,702.6 4,272.6 4,041.4
Total revenues                 4,702.6 4,272.6 4,041.4
Total assets 7,168.5       6,556.3       7,168.5 6,556.3 5,882.9
Goodwill - net 2,340.0       2,138.5       2,340.0 2,138.5  
Unites States [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 2,314.2       2,115.0       2,314.2 2,115.0  
Unites States [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 25.8       23.5       25.8 23.5  
United Kingdom [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 717.6 712.1 766.9
Total revenues                 717.6 712.1 766.9
Total assets 2,712.2       2,383.7       2,712.2 2,383.7 2,652.1
Goodwill - net 745.7       666.5       745.7 666.5  
United Kingdom [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 738.5       662.2       738.5 662.2  
United Kingdom [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 7.2       4.3       7.2 4.3  
Australia [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 270.9 245.5 256.7
Total revenues                 270.9 245.5 256.7
Total assets 1,110.6       951.3       1,110.6 951.3 951.4
Goodwill - net 416.6       382.7       416.6 382.7  
Australia [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 416.6       382.7       416.6 382.7  
Canada [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 155.4 138.2 136.6
Total revenues                 155.4 138.2 136.6
Total assets 733.4       576.1       733.4 576.1 578.1
Goodwill - net 375.3       292.2       375.3 292.2  
Canada [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 375.3       292.2       375.3 292.2  
New Zealand [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 150.5 125.8 122.6
Total revenues                 150.5 125.8 122.6
Total assets 726.3       673.3       726.3 673.3 627.2
Goodwill - net 218.9       205.3       218.9 205.3  
New Zealand [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 209.3       205.0       209.3 205.0  
New Zealand [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 9.6       0.3       9.6 0.3  
Other Foreign [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 162.6 100.6 68.2
Total revenues                 162.6 100.6 68.2
Total assets 446.4       348.9       446.4 348.9 222.1
Goodwill - net 101.4       82.6       101.4 82.6  
Other Foreign [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 98.4       79.8       98.4 79.8  
Other Foreign [Member] | Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Goodwill - net 3.0       2.8       3.0 2.8  
Operating Segments [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Commissions                 2,627.1 2,439.1 2,338.7
Fees                 868.8 775.7 705.8
Supplemental revenues                 163.7 147.0 125.5
Contingent revenues                 111.8 107.2 93.7
Investment income                 55.7 52.3 53.6
Gains on books of business sales and other                 3.4 6.6 6.7
Total revenues                 3,830.5 3,527.9 3,324.0
Compensation                 2,217.2 2,041.8 1,939.7
Operating                 613.9 600.9 638.1
Depreciation                 61.8 57.2 54.4
Amortization                 261.8 244.7 237.3
Change in estimated acquisition earnout payables                 29.3 32.1 41.1
Total expenses                 3,184.0 2,976.7 2,910.6
Earnings (loss) before income taxes                 646.5 551.2 413.4
Provision (benefit) for income taxes                 222.5 194.1 145.3
Net earnings                 424.0 357.1 268.1
Net earnings attributable to noncontrolling interests                 8.1 3.6 1.7
Net earnings attributable to controlling interests                 415.9 353.5 266.4
Net foreign exchange gain (loss)                 (1.6) 2.9 (0.2)
Total revenues                 3,830.5 3,527.9 3,324.0
Total assets 10,336.4       9,183.4       10,336.4 9,183.4 8,969.7
Goodwill - net 4,152.3       3,736.9       4,152.3 3,736.9 3,635.6
Amortizable intangible assets - net 1,630.6       1,613.6       1,630.6 1,613.6 1,677.8
Operating Segments [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Fees                 768.0 717.1 726.5
Investment income                 0.6 1.0 0.6
Total revenues                 768.6 718.1 727.1
Compensation                 446.9 424.5 427.2
Operating                 189.2 171.4 180.8
Depreciation                 31.1 27.2 24.3
Amortization                 2.9 2.5 3.0
Change in estimated acquisition earnout payables                 1.6   (0.5)
Total expenses                 671.7 625.6 634.8
Earnings (loss) before income taxes                 96.9 92.5 92.3
Provision (benefit) for income taxes                 37.0 35.3 35.1
Net earnings                 59.9 57.2 57.2
Net earnings attributable to controlling interests                 59.9 57.2 57.2
Net foreign exchange gain (loss)                 (0.1)    
Total revenues                 768.6 718.1 727.1
Total assets 735.2       666.4       735.2 666.4 660.1
Goodwill - net 42.6       28.1       42.6 28.1 27.3
Amortizable intangible assets - net 14.0       13.7       14.0 13.7 21.0
Operating Segments [Member] | Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Revenue from clean coal activities                 1,560.5 1,350.1 1,310.8
Other - net gain                   (1.3) 30.5
Total revenues                 1,560.5 1,348.8 1,341.3
Compensation                 88.2 72.6 62.0
Operating                 49.4 25.4 21.8
Cost of revenues from clean coal activities                 1,635.9 1,408.6 1,351.5
Interest                 124.1 109.8 103.0
Depreciation                 28.2 19.2 15.2
Total expenses                 1,925.8 1,635.6 1,553.5
Earnings (loss) before income taxes                 (365.3) (286.8) (212.2)
Provision (benefit) for income taxes                 (380.6) (317.5) (276.0)
Net earnings                 15.3 30.7 63.8
Net earnings attributable to noncontrolling interests                 28.0 27.0 30.6
Net earnings attributable to controlling interests                 (12.7) 3.7 33.2
Net foreign exchange gain (loss)                 (1.1) 0.1 0.4
Total revenues                 1,560.5 1,348.8 1,341.3
Total assets 1,825.8       1,639.8       1,825.8 1,639.8 1,284.0
Goodwill - net 3.0       2.8       3.0 2.8  
Operating Segments [Member] | Unites States [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 2,537.4 2,334.4 2,122.1
Total revenues                 2,537.4 2,334.4 2,122.1
Total assets 4,799.6       4,393.6       4,799.6 4,393.6 4,092.8
Operating Segments [Member] | Unites States [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 639.5 610.3 591.8
Total revenues                 639.5 610.3 591.8
Total assets 569.5       540.5       569.5 540.5 525.2
Operating Segments [Member] | Unites States [Member] | Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,525.7 1,327.9 1,327.5
Total revenues                 1,525.7 1,327.9 1,327.5
Total assets 1,799.4       1,622.2       1,799.4 1,622.2 1,264.9
Operating Segments [Member] | United Kingdom [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 686.7 686.5 738.5
Total revenues                 686.7 686.5 738.5
Total assets 2,620.9       2,321.9       2,620.9 2,321.9 2,580.0
Operating Segments [Member] | United Kingdom [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 30.9 25.6 28.4
Total revenues                 30.9 25.6 28.4
Total assets 91.3       61.8       91.3 61.8 72.1
Operating Segments [Member] | Australia [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 192.7 172.5 157.3
Total revenues                 192.7 172.5 157.3
Total assets 1,061.7       894.4       1,061.7 894.4 895.8
Operating Segments [Member] | Australia [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 78.2 73.0 99.4
Total revenues                 78.2 73.0 99.4
Total assets 48.9       56.9       48.9 56.9 55.6
Operating Segments [Member] | Canada [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 150.7 134.1 133.1
Total revenues                 150.7 134.1 133.1
Total assets 726.6       573.3       726.6 573.3 575.0
Operating Segments [Member] | Canada [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 4.7 4.1 3.5
Total revenues                 4.7 4.1 3.5
Total assets 6.8       2.8       6.8 2.8 3.1
Operating Segments [Member] | New Zealand [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 135.2 120.7 118.6
Total revenues                 135.2 120.7 118.6
Total assets 707.6       668.9       707.6 668.9 623.1
Operating Segments [Member] | New Zealand [Member] | Risk Management [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 15.3 5.1 4.0
Total revenues                 15.3 5.1 4.0
Total assets 18.7       4.4       18.7 4.4 4.1
Operating Segments [Member] | Other Foreign [Member] | Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 127.8 79.7 54.4
Total revenues                 127.8 79.7 54.4
Total assets 420.0       331.3       420.0 331.3 203.0
Operating Segments [Member] | Other Foreign [Member] | Corporate [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 34.8 20.9 13.8
Total revenues                 34.8 20.9 13.8
Total assets $ 26.4       $ 17.6       $ 26.4 $ 17.6 $ 19.1