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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2024
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents $ 18.0
Fiduciary assets 38.1
Other current assets 37.3
Fixed assets 5.1
Noncurrent assets 7.9
Goodwill 410.7
Expiration lists 368.1
Non-compete agreements 8.6
Trade names 0.3
Total assets acquired 894.1
Fiduciary liabilities 38.1
Current liabilities 24.2
Noncurrent liabilities 20.4
Total liabilities assumed 82.7
Total net assets acquired 811.4
Ericson Insurance Services [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 0.1
Fiduciary assets 1.0
Other current assets 3.5
Noncurrent assets 0.1
Goodwill 27.4
Expiration lists 35.9
Non-compete agreements 0.5
Total assets acquired 68.5
Fiduciary liabilities 1.0
Current liabilities 0.8
Noncurrent liabilities 0.1
Total liabilities assumed 1.9
Total net assets acquired 66.6
The Rowley Agency [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 4.1
Fiduciary assets 2.6
Other current assets 0.5
Fixed assets 0.4
Noncurrent assets 1.7
Goodwill 65.8
Expiration lists 57.4
Non-compete agreements 0.6
Total assets acquired 133.1
Fiduciary liabilities 2.6
Current liabilities 0.6
Noncurrent liabilities 1.7
Total liabilities assumed 4.9
Total net assets acquired 128.2
OPR [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 0.8
Fiduciary assets 0.0
Other current assets 2.7
Fixed assets 0.0
Noncurrent assets 2.0
Goodwill 41.9
Expiration lists 22.1
Non-compete agreements 0.2
Total assets acquired 69.7
Fiduciary liabilities 0.0
Current liabilities 1.1
Noncurrent liabilities 2.2
Total liabilities assumed 3.3
Total net assets acquired 66.4
Twenty-Five Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 13.0
Fiduciary assets 34.5
Other current assets 30.6
Fixed assets 4.7
Noncurrent assets 4.1
Goodwill 275.6
Expiration lists 252.7
Non-compete agreements 7.3
Trade names 0.3
Total assets acquired 622.8
Fiduciary liabilities 34.5
Current liabilities 21.7
Noncurrent liabilities 16.4
Total liabilities assumed 72.6
Total net assets acquired $ 550.2