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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 13.7
Other current assets 131.8
Fixed assets 6.5
Noncurrent assets 9.0
Goodwill 404.7
Expiration lists 318.2
Non-compete agreements 2.8
Trade names 35.5
Total assets acquired 922.2
Current liabilities 115.6
Noncurrent liabilities 88.3
Total liabilities assumed 203.9
Total net assets acquired 718.3
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 24.6
Expiration lists 19.6
Trade names 0.1
Total assets acquired 47.8
Current liabilities 2.3
Noncurrent liabilities 1.0
Total liabilities assumed 3.3
Total net assets acquired 44.5
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 66.8
Fixed assets 2.6
Noncurrent assets 8.3
Goodwill 193.3
Expiration lists 105.7
Non-compete agreements 0.3
Trade names 35.4
Total assets acquired 419.6
Current liabilities 62.2
Noncurrent liabilities 43.9
Total liabilities assumed 106.1
Total net assets acquired 313.5
Reassurance Holdings, Inc (RHI) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 18.4
Fixed assets 1.4
Noncurrent assets 0.5
Goodwill 63.1
Expiration lists 72.4
Non-compete agreements 0.8
Total assets acquired 156.6
Current liabilities 7.2
Noncurrent liabilities 19.0
Total liabilities assumed 26.2
Total net assets acquired 130.4
25 Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 6.4
Other current assets 43.1
Fixed assets 0.7
Noncurrent assets 0.2
Goodwill 118.5
Expiration lists 105.4
Non-compete agreements 1.6
Total assets acquired 275.9
Current liabilities 43.5
Noncurrent liabilities 23.6
Total liabilities assumed 67.1
Total net assets acquired $ 208.8