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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Dec. 31, 2024
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents $ 50.7
Fiduciary assets 53.1
Other current assets 108.1
Fixed assets 11.6
Noncurrent assets 16.8
Goodwill 837.2
Expiration lists 791.5
Non-compete agreements 23.6
Trade names 1.9
Total assets acquired 1,894.5
Fiduciary liabilities 53.1
Current liabilities 57.6
Noncurrent liabilities 84.0
Total liabilities assumed 194.7
Total net assets acquired 1,699.8
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 3.4
Fixed assets 0.0
Noncurrent assets 0.1
Goodwill 29.6
Expiration lists 34.2
Non-compete agreements 0.2
Trade names 0.2
Total assets acquired 68.8
Fiduciary liabilities 1.0
Current liabilities 0.8
Noncurrent liabilities 0.1
Total liabilities assumed 1.9
Total net assets acquired 66.9
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 59.4
Expiration lists 64.1
Non-compete agreements 0.3
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
Operationsinc [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
Trade names 0.0
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
RIBV [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 1.5
Other current assets 28.7
Fixed assets 2.8
Noncurrent assets 0.2
Goodwill 92.4
Expiration lists 98.7
Non-compete agreements 0.2
Trade names 0.9
Total assets acquired 225.4
Current liabilities 11.9
Noncurrent liabilities 6.2
Total liabilities assumed 18.1
Total net assets acquired 207.3
RED [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 19.9
Other current assets 6.8
Fixed assets 2.9
Noncurrent assets 3.6
Goodwill 107.0
Expiration lists 84.2
Non-compete agreements 8.8
Total assets acquired 233.2
Current liabilities 5.9
Noncurrent liabilities 26.9
Total liabilities assumed 32.8
Total net assets acquired 200.4
Forty-three Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 24.3
Fiduciary assets 49.5
Other current assets 66.0
Fixed assets 5.5
Noncurrent assets 9.2
Goodwill 506.9
Expiration lists 488.2
Non-compete agreements 13.9
Trade names 0.8
Total assets acquired 1,164.3
Fiduciary liabilities 49.5
Current liabilities 37.3
Noncurrent liabilities 46.9
Total liabilities assumed 133.7
Total net assets acquired $ 1,030.6