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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 6.4
Other current assets 36.0
Fixed assets 3.6
Noncurrent assets 0.2
Goodwill 228.1
Expiration lists 188.9
Non-compete agreements 2.8
Total assets acquired 466.0
Current liabilities 34.3
Noncurrent liabilities 14.7
Total liabilities assumed 49.0
Total net assets acquired 417.0
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 - Mannny 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 27.1
Expiration lists 21.1
Non-compete agreements 0.5
Total assets acquired 63.7
Current liabilities 11.6
Noncurrent liabilities 5.8
Total liabilities assumed 17.4
Total net assets acquired 46.3
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 15.0
Expiration lists 14.8
Non-compete agreements 0.1
Total assets acquired 31.9
Current liabilities 1.0
Total liabilities assumed 1.0
Total net assets acquired 30.9
Twenty- three Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 5.4
Other current assets 7.7
Fixed assets 1.2
Goodwill 72.4
Expiration lists 63.8
Non-compete agreements 1.8
Total assets acquired 152.3
Current liabilities 9.9
Noncurrent liabilities 8.9
Total liabilities assumed 18.8
Total net assets acquired $ 133.5