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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2021
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 69.4
Other current assets 194.6
Fixed assets 11.4
Noncurrent assets 12.9
Goodwill 453.5
Expiration lists 279.9
Non-compete agreements 3.8
Trade names 4.7
Total assets acquired 1,030.2
Current liabilities 227.3
Noncurrent liabilities 36.3
Total liabilities assumed 263.6
Total net assets acquired 766.6
Atlas General Holdings LLC [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 32.8
Other current assets 112.0
Fixed assets 7.4
Noncurrent assets 1.2
Goodwill 45.9
Expiration lists 39.7
Non-compete agreements 0.3
Total assets acquired 239.3
Current liabilities 129.8
Noncurrent liabilities 0.2
Total liabilities assumed 130.0
Total net assets acquired 109.3
Bollington Wilson Group [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 24.9
Other current assets 15.3
Fixed assets 3.8
Noncurrent assets 5.3
Goodwill 257.1
Expiration lists 81.6
Non-compete agreements 1.2
Trade names 3.4
Total assets acquired 392.6
Current liabilities 39.6
Noncurrent liabilities 23.6
Total liabilities assumed 63.2
Total net assets acquired 329.4
LDJ American Online Benefits Group, LLC [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 0.7
Other current assets 15.8
Noncurrent assets 0.2
Goodwill 25.7
Expiration lists 25.4
Non-compete agreements 0.2
Trade names 0.2
Total assets acquired 68.2
Current liabilities 8.0
Noncurrent liabilities 0.1
Total liabilities assumed 8.1
Total net assets acquired 60.1
Sixteen Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 11.0
Other current assets 51.5
Fixed assets 0.2
Noncurrent assets 6.2
Goodwill 124.8
Expiration lists 133.2
Non-compete agreements 2.1
Trade names 1.1
Total assets acquired 330.1
Current liabilities 49.9
Noncurrent liabilities 12.4
Total liabilities assumed 62.3
Total net assets acquired $ 267.8