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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Mar. 31, 2024
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents $ 8.5
Fiduciary assets 14.0
Other current assets 8.5
Fixed assets 0.5
Noncurrent assets 2.8
Goodwill 187.3
Expiration lists 181.4
Non-compete agreements 4.4
Total assets acquired 407.4
Fiduciary liabilities 14.0
Current liabilities 8.6
Noncurrent liabilities 8.9
Total liabilities assumed 31.5
Total net assets acquired 375.9
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
Ten Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 4.3
Fiduciary assets 10.4
Other current assets 4.5
Fixed assets 0.1
Noncurrent assets 1.0
Goodwill 94.1
Expiration lists 88.1
Non-compete agreements 3.3
Total assets acquired 205.8
Fiduciary liabilities 10.4
Current liabilities 7.2
Noncurrent liabilities 7.1
Total liabilities assumed 24.7
Total net assets acquired $ 181.1