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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Mar. 31, 2025
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents $ 20.8
Fiduciary assets 117.9
Other current assets 27.0
Fixed assets 2.9
Noncurrent assets 4.2
Goodwill 258.0
Expiration lists 200.8
Non-compete agreements 16.9
Total assets acquired 648.5
Fiduciary liabilities 117.9
Current liabilities 25.4
Noncurrent liabilities 66.9
Total liabilities assumed 210.2
Total net assets acquired 438.3
W K Webster & Co Ltd [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 5.3
Fiduciary assets 86.8
Other current assets 16.7
Fixed assets 1.1
Noncurrent assets 2.2
Goodwill 83.7
Expiration lists 70.9
Non-compete agreements 7.9
Total assets acquired 274.6
Fiduciary liabilities 86.8
Current liabilities 11.8
Noncurrent liabilities 21.8
Total liabilities assumed 120.4
Total net assets acquired 154.2
Case Group [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 5.6
Fiduciary assets 0.0
Other current assets 4.0
Fixed assets 1.0
Goodwill 49.5
Expiration lists 36.2
Non-compete agreements 7.3
Total assets acquired 103.6
Fiduciary liabilities 0.0
Current liabilities 7.3
Noncurrent liabilities 13.5
Total liabilities assumed 20.8
Total net assets acquired 82.8
Nine Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and cash equivalents 9.9
Fiduciary assets 31.1
Other current assets 6.3
Fixed assets 0.8
Noncurrent assets 2.0
Goodwill 124.8
Expiration lists 93.7
Non-compete agreements 1.7
Total assets acquired 270.3
Fiduciary liabilities 31.1
Current liabilities 6.3
Noncurrent liabilities 31.6
Total liabilities assumed 69.0
Total net assets acquired $ 201.3