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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Commissions                 $ 1,553.1 $ 1,302.5 $ 1,127.4
Fees                 1,059.5 971.7 870.2
Supplemental commissions                 77.3 67.9 56.0
Contingent commissions                 52.1 42.9 38.1
Investment income                 8.1 10.4 8.1
Gains on books of business sales and other                 5.2 3.9 5.5
Revenue from clean coal activities                 412.5 119.6 29.2
Other - net gain                 11.8 1.4 0.2
Total revenues 890.2 835.8 779.5 674.1 673.2 650.4 649.9 546.8 3,179.6 2,520.3 2,134.7
Compensation                 1,685.0 1,493.4 1,326.1
Operating                 552.4 483.2 419.0
Cost of revenues from clean coal activities                 437.3 111.6 32.0
Interest                 50.1 43.0 40.8
Depreciation                 53.4 41.4 35.9
Amortization                 125.2 99.0 79.3
Change in estimated acquisition earnout payables                 1.7 3.4 (6.2)
Total expenses (840.9) (750.3) (682.1) (631.8) (627.8) (574.1) (558.8) (514.3) 2,905.1 2,275.0 1,926.9
Earnings (loss) before income taxes 49.3 85.5 97.4 42.3 45.4 76.3 91.1 32.5 274.5 245.3 207.8
Provision (benefit) for income taxes                 5.9 50.3 63.7
Net earnings                 268.6 195.0 144.1
Net foreign exchange gain (loss)                 0.2 (1.9) (0.2)
Total revenues 890.2 835.8 779.5 674.1 673.2 650.4 649.9 546.8 3,179.6 2,520.3 2,134.7
Total assets 6,860.5       5,352.3       6,860.5 5,352.3 4,483.5
Goodwill - net 2,145.2       1,472.7       2,145.2 1,472.7 1,155.3
Amortizable intangible assets - net 1,078.8       809.6       1,078.8 809.6 561.5
Unites States [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 2,542.6 2,006.1 1,725.1
Total revenues                 2,542.6 2,006.1 1,725.1
Total assets 4,422.4       3,675.9       4,422.4 3,675.9 3,202.5
Goodwill - net 1,469.8       1,177.3       1,469.8 1,177.3  
United Kingdom [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 434.4 352.3 260.5
Total revenues                 434.4 352.3 260.5
Total assets 1,878.3       1,170.0       1,878.3 1,170.0 946.2
Goodwill - net 597.2       226.0       597.2 226.0  
Other Foreign, Principally Australia and Canada [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 202.6 161.9 149.1
Total revenues                 202.6 161.9 149.1
Total assets 559.8       506.4       559.8 506.4 334.8
Goodwill - net 78.2       69.4       78.2 69.4  
Brokerage [Member]
                     
Segment Reporting Information [Line Items]                      
Commissions                 1,553.1 1,302.5 1,127.4
Fees                 450.5 403.2 324.1
Supplemental commissions                 77.3 67.9 56.0
Contingent commissions                 52.1 42.9 38.1
Investment income                 6.1 7.2 5.4
Gains on books of business sales and other                 5.2 3.9 5.5
Total revenues                 2,144.3 1,827.6 1,556.5
Compensation                 1,290.4 1,131.6 968.4
Operating                 369.9 312.7 267.3
Depreciation                 31.1 24.7 21.2
Amortization                 122.7 96.2 77.0
Change in estimated acquisition earnout payables                 2.6 3.6 (6.2)
Total expenses                 1,816.7 1,568.8 1,327.7
Earnings (loss) before income taxes                 327.6 258.8 228.8
Provision (benefit) for income taxes                 122.8 103.0 88.6
Net earnings                 204.8 155.8 140.2
Net foreign exchange gain (loss)                 0.6 (1.6)   
Total revenues                 2,144.3 1,827.6 1,556.5
Total assets 5,522.7       4,196.8       5,522.7 4,196.8 3,346.6
Goodwill - net 2,122.9       1,451.4       2,122.9 1,451.4 1,136.6
Amortizable intangible assets - net 1,061.6       791.6       1,061.6 791.6 542.3
Brokerage [Member] | Unites States [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 1,644.8 1,431.6 1,266.2
Total revenues                 1,644.8 1,431.6 1,266.2
Total assets 3,219.6       2,637.1       3,219.6 2,637.1 2,215.3
Goodwill - net 1,449.6       1,158.1       1,449.6 1,158.1  
Brokerage [Member] | United Kingdom [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 407.0 324.1 236.2
Total revenues                 407.0 324.1 236.2
Total assets 1,819.5       1,117.6       1,819.5 1,117.6 874.8
Goodwill - net 595.1       223.9       595.1 223.9  
Brokerage [Member] | Other Foreign, Principally Australia and Canada [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 92.5 71.9 54.1
Total revenues                 92.5 71.9 54.1
Total assets 483.6       442.1       483.6 442.1 256.5
Goodwill - net 78.2       69.4       78.2 69.4  
Risk Management [Member]
                     
Segment Reporting Information [Line Items]                      
Commissions                       
Fees                 609.0 568.5 546.1
Investment income                 2.0 3.2 2.7
Total revenues                 611.0 571.7 548.8
Compensation                 370.5 347.0 344.1
Operating                 146.0 137.7 135.8
Depreciation                 19.4 16.0 14.2
Amortization                 2.5 2.8 2.3
Change in estimated acquisition earnout payables                 (0.9) (0.2)  
Total expenses                 537.5 503.3 496.4
Earnings (loss) before income taxes                 73.5 68.4 52.4
Provision (benefit) for income taxes                 27.3 25.9 19.1
Net earnings                 46.2 42.5 33.3
Net foreign exchange gain (loss)                   (0.1)   
Total revenues                 611.0 571.7 548.8
Total assets 544.7       498.6       544.7 498.6 529.1
Goodwill - net 22.3       21.3       22.3 21.3 18.7
Amortizable intangible assets - net 17.2       18.0       17.2 18.0 19.2
Risk Management [Member] | Unites States [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 473.5 453.5 429.5
Total revenues                 473.5 453.5 429.5
Total assets 419.0       390.9       419.0 390.9 384.5
Goodwill - net 20.2       19.2       20.2 19.2  
Risk Management [Member] | United Kingdom [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 27.4 28.2 24.3
Total revenues                 27.4 28.2 24.3
Total assets 58.8       52.4       58.8 52.4 71.4
Goodwill - net 2.1       2.1       2.1 2.1  
Risk Management [Member] | Other Foreign, Principally Australia and Canada [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 110.1 90.0 95.0
Total revenues                 110.1 90.0 95.0
Total assets 66.9       55.3       66.9 55.3 73.2
Goodwill - net 0       0       0 0  
Corporate [Member]
                     
Segment Reporting Information [Line Items]                      
Commissions                       
Revenue from clean coal activities                 412.5 119.6 29.2
Other - net gain                 11.8 1.4 0.2
Total revenues                 424.3 121.0 29.4
Compensation                 24.1 14.8 13.6
Operating                 36.5 32.8 15.9
Cost of revenues from clean coal activities                 437.3 111.6 32.0
Interest                 50.1 43.0 40.8
Depreciation                 2.9 0.7 0.5
Total expenses                 550.9 202.9 102.8
Earnings (loss) before income taxes                 (126.6) (81.9) (73.4)
Provision (benefit) for income taxes                 (144.2) (78.6) (44.0)
Net earnings                 17.6 (3.3) (29.4)
Net foreign exchange gain (loss)                 (0.4) (0.2) (0.2)
Total revenues                 424.3 121.0 29.4
Total assets 793.1       656.9       793.1 656.9 607.8
Goodwill - net 0       0       0 0   
Corporate [Member] | Unites States [Member]
                     
Segment Reporting Information [Line Items]                      
Total revenues                 424.3 121.0 29.4
Total revenues                 424.3 121.0 29.4
Total assets 783.8       647.9       783.8 647.9 602.7
Goodwill - net 0       0       0 0  
Corporate [Member] | United Kingdom [Member]
                     
Segment Reporting Information [Line Items]                      
Goodwill - net 0       0       0 0  
Corporate [Member] | Other Foreign, Principally Australia and Canada [Member]
                     
Segment Reporting Information [Line Items]                      
Total assets 9.3       9.0       9.3 9.0 5.1
Goodwill - net $ 0       $ 0       $ 0 $ 0