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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Jun. 30, 2024
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents $ 14.9
Fiduciary assets 37.7
Other current assets 18.0
Fixed assets 1.1
Noncurrent assets 7.6
Goodwill 341.0
Expiration lists 300.9
Non-compete agreements 7.5
Trade names 0.3
Total assets acquired 729.0
Fiduciary liabilities 37.7
Current liabilities 17.2
Noncurrent liabilities 20.1
Total liabilities assumed 75.0
Total net assets acquired 654.0
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 One Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 9.9
Fiduciary assets 34.1
Other current assets 11.3
Fixed assets 0.7
Noncurrent assets 3.8
Goodwill 205.9
Expiration lists 185.5
Non-compete agreements 6.2
Trade names 0.3
Total assets acquired 457.7
Fiduciary liabilities 34.1
Current liabilities 14.7
Noncurrent liabilities 16.1
Total liabilities assumed 64.9
Total net assets acquired $ 392.8