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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Mar. 31, 2023
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 16.8
Fiduciary assets 24.1
Other current assets 5.8
Fixed assets 1.1
Noncurrent assets 16.2
Goodwill 181.2
Expiration lists 147.6
Non-compete agreements 6.8
Trade names 1.3
Total assets acquired 400.9
Fiduciary liabilities 24.1
Current liabilities 7.4
Noncurrent liabilities 29.2
Total liabilities assumed 60.7
Total net assets acquired 340.2
FIR [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 13.0
Fiduciary assets 13.8
Other current assets 1.5
Fixed assets 0.8
Noncurrent assets 8.6
Goodwill 58.8
Expiration lists 27.5
Non-compete agreements 4.3
Total assets acquired 128.3
Fiduciary liabilities 13.8
Current liabilities 3.9
Noncurrent liabilities 13.0
Total liabilities assumed 30.7
Total net assets acquired 97.6
Nine Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 3.8
Fiduciary assets 10.3
Other current assets 4.3
Fixed assets 0.3
Noncurrent assets 7.6
Goodwill 122.4
Expiration lists 120.1
Non-compete agreements 2.5
Trade names 1.3
Total assets acquired 272.6
Fiduciary liabilities 10.3
Current liabilities 3.5
Noncurrent liabilities 16.2
Total liabilities assumed 30.0
Total net assets acquired $ 242.6