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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 9.9
Other current assets 38.2
Fixed assets 4.6
Noncurrent assets 0.2
Goodwill 304.5
Expiration lists 241.4
Non-compete agreements 3.6
Trade names 0.1
Total assets acquired 602.5
Current liabilities 37.0
Noncurrent liabilities 19.6
Total liabilities assumed 56.6
Total net assets acquired 545.9
Construction Risk Solutions, LLC [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 3.6
Goodwill 20.3
Expiration lists 14.6
Non-compete agreements 0.1
Total assets acquired 38.6
Current liabilities 3.2
Total liabilities assumed 3.2
Total net assets acquired 35.4
Hill, Chesson And Woody [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 2.1
Noncurrent assets 0.2
Goodwill 29.9
Expiration lists 19.2
Non-compete agreements 0.1
Total assets acquired 51.5
Current liabilities 0.1
Total liabilities assumed 0.1
Total net assets acquired 51.4
Presidio Group, Inc. [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 2.4
Fixed assets 0.5
Goodwill 25.6
Expiration lists 27.9
Non-compete agreements 0.1
Total assets acquired 56.5
Current liabilities 2.9
Total liabilities assumed 2.9
Total net assets acquired 53.6
Commercial Insurance Brokers [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 0.1
Other current assets 3.6
Fixed assets 0.1
Goodwill 11.7
Expiration lists 9.0
Total assets acquired 24.5
Current liabilities 4.0
Total liabilities assumed 4.0
Total net assets acquired 20.5
Williams - Manny Insurance Group [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 0.3
Other current assets 1.8
Fixed assets 0.2
Goodwill 26.1
Expiration lists 18.5
Non-compete agreements 0.1
Total assets acquired 47.0
Current liabilities 1.6
Total liabilities assumed 1.6
Total net assets acquired 45.4
GPL Assurance Inc. (GPL) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 0.4
Other current assets 13.6
Fixed assets 1.0
Goodwill 33.4
Expiration lists 14.5
Non-compete agreements 0.5
Trade names 0.1
Total assets acquired 63.5
Current liabilities 11.6
Noncurrent liabilities 4.1
Total liabilities assumed 15.7
Total net assets acquired 47.8
Lutgert Insurance (LI) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 0.2
Other current assets 1.2
Fixed assets 0.6
Goodwill 18.9
Expiration lists 12.9
Non-compete agreements 0.1
Total assets acquired 33.9
Current liabilities 1.0
Total liabilities assumed 1.0
Total net assets acquired 32.9
DiBrina Group (DBG) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 0.3
Fixed assets 0.9
Goodwill 33.5
Expiration lists 21.6
Total assets acquired 56.3
Current liabilities 0.1
Total liabilities assumed 0.1
Total net assets acquired 56.2
31 Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 8.9
Other current assets 9.6
Fixed assets 1.3
Goodwill 105.1
Expiration lists 103.2
Non-compete agreements 2.6
Total assets acquired 230.7
Current liabilities 12.5
Noncurrent liabilities 15.5
Total liabilities assumed 28.0
Total net assets acquired $ 202.7