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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 4.6
Other current assets 19.8
Fixed assets 1.7
Noncurrent assets 0.2
Goodwill 154.4
Expiration lists 148.7
Non-compete agreements 2.9
Total assets acquired 332.3
Current liabilities 19.5
Noncurrent liabilities 7.4
Total liabilities assumed 26.9
Total net assets acquired 305.4
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 7.4
Expiration lists 13.2
Non-compete agreements 0.1
Total assets acquired 24.5
Current liabilities 4.1
Total liabilities assumed 4.1
Total net assets acquired 20.4
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 0.3
Goodwill 17.3
Expiration lists 24.9
Non-compete agreements 0.9
Total assets acquired 45.5
Current liabilities 1.6
Total liabilities assumed 1.6
Total net assets acquired 43.9
Eighteen Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 4.2
Other current assets 6.3
Fixed assets 0.8
Goodwill 53.9
Expiration lists 48.9
Non-compete agreements 1.6
Total assets acquired 115.7
Current liabilities 7.6
Noncurrent liabilities 7.4
Total liabilities assumed 15.0
Total net assets acquired $ 100.7