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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 12.3
Other current assets 59.4
Fixed assets 4.8
Noncurrent assets 8.3
Goodwill 294.5
Expiration lists 204.0
Non-compete agreements 1.7
Trade names 35.4
Total assets acquired 620.4
Current liabilities 53.5
Noncurrent liabilities 60.1
Total liabilities assumed 113.6
Total net assets acquired 506.8
Market Financial Group, Ltd and Austin Consulting Group Inc. (MFG) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 0.1
Other current assets 3.0
Fixed assets 0.4
Goodwill 24.7
Expiration lists 20.2
Non-compete agreements 0.1
Total assets acquired 48.5
Current liabilities 2.3
Noncurrent liabilities 0.4
Total liabilities assumed 2.7
Total net assets acquired 45.8
McGregor & Associates (M&A) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 0.5
Fixed assets 1.4
Goodwill 5.2
Expiration lists 15.1
Non-compete agreements 0.1
Total assets acquired 22.3
Current liabilities 0.4
Noncurrent liabilities 0.8
Total liabilities assumed 1.2
Total net assets acquired 21.1
Pronto Insurance (PI) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 7.2
Other current assets 35.3
Fixed assets 2.6
Noncurrent assets 8.3
Goodwill 194.1
Expiration lists 105.7
Non-compete agreements 0.3
Trade names 35.4
Total assets acquired 388.9
Current liabilities 31.5
Noncurrent liabilities 43.9
Total liabilities assumed 75.4
Total net assets acquired 313.5
Sixteen Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 5.0
Other current assets 20.6
Fixed assets 0.4
Goodwill 70.5
Expiration lists 63.0
Non-compete agreements 1.2
Total assets acquired 160.7
Current liabilities 19.3
Noncurrent liabilities 15.0
Total liabilities assumed 34.3
Total net assets acquired $ 126.4