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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
 3 Months Ended 6 Months Ended 282 Months Ended
Jun. 30, 2025
USD ($)
acquisition
Jun. 30, 2024
acquisition
Jun. 30, 2025
USD ($)
acquisition
Jun. 30, 2024
acquisition
Jun. 30, 2025
USD ($)
company
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents $ 93.5   $ 93.5   $ 93.5
Fiduciary assets 593.7   593.7   593.7
Other current assets 107.0   107.0   107.0
Fixed assets 16.0   16.0   16.0
Noncurrent assets 30.1   30.1   30.1
Goodwill 1,027.7   1,027.7   1,027.7
Expiration lists 935.7   935.7   935.7
Non-compete agreements 21.6   21.6   21.6
Total assets acquired 2,825.3   2,825.3   2,825.3
Fiduciary liabilities 593.7   593.7   593.7
Current liabilities 65.1   65.1   65.1
Noncurrent liabilities 299.7   299.7   299.7
Total liabilities assumed 958.5   958.5   958.5
Total net assets acquired $ 1,866.8   $ 1,866.8   $ 1,866.8
Number of companies acquired 36 30 56 58 770
W K Webster & Co Ltd February 1, 2025 (WKW)          
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents $ 5.3   $ 5.3   $ 5.3
Fiduciary assets 86.8   86.8   86.8
Other current assets 16.7   16.7   16.7
Fixed assets 1.1   1.1   1.1
Noncurrent assets 2.2   2.2   2.2
Goodwill 83.7   83.7   83.7
Expiration lists 70.9   70.9   70.9
Non-compete agreements 7.9   7.9   7.9
Total assets acquired 274.6   274.6   274.6
Fiduciary liabilities 86.8   86.8   86.8
Current liabilities 11.8   11.8   11.8
Noncurrent liabilities 21.8   21.8   21.8
Total liabilities assumed 120.4   120.4   120.4
Total net assets acquired 154.2   154.2   154.2
Case Group February 26, 2025 (CSG)          
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents 5.6   5.6   5.6
Fiduciary assets 0.0   0.0   0.0
Other current assets 4.0   4.0   4.0
Fixed assets 1.0   1.0   1.0
Noncurrent assets 0.0   0.0   0.0
Goodwill 49.5   49.5   49.5
Expiration lists 36.2   36.2   36.2
Non-compete agreements 7.3   7.3   7.3
Total assets acquired 103.6   103.6   103.6
Fiduciary liabilities 0.0   0.0   0.0
Current liabilities 7.3   7.3   7.3
Noncurrent liabilities 13.5   13.5   13.5
Total liabilities assumed 20.8   20.8   20.8
Total net assets acquired 82.8   82.8   82.8
Woodruff Sawyer & Co April 10, 2025 (WSC)          
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents 61.9   61.9   61.9
Fiduciary assets 465.3   465.3   465.3
Other current assets 77.6   77.6   77.6
Fixed assets 12.8   12.8   12.8
Noncurrent assets 25.0   25.0   25.0
Goodwill 658.1   658.1   658.1
Expiration lists 673.4   673.4   673.4
Non-compete agreements 2.4   2.4   2.4
Total assets acquired 1,976.5   1,976.5   1,976.5
Fiduciary liabilities 465.3   465.3   465.3
Current liabilities 35.2   35.2   35.2
Noncurrent liabilities 201.7   201.7   201.7
Total liabilities assumed 702.2   702.2   702.2
Total net assets acquired 1,274.3   1,274.3   1,274.3
Seventeen Other Acquisitions          
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents 20.7   20.7   20.7
Fiduciary assets 41.6   41.6   41.6
Other current assets 8.7   8.7   8.7
Fixed assets 1.1   1.1   1.1
Noncurrent assets 2.9   2.9   2.9
Goodwill 236.4   236.4   236.4
Expiration lists 155.2   155.2   155.2
Non-compete agreements 4.0   4.0   4.0
Total assets acquired 470.6   470.6   470.6
Fiduciary liabilities 41.6   41.6   41.6
Current liabilities 10.8   10.8   10.8
Noncurrent liabilities 62.7   62.7   62.7
Total liabilities assumed 115.1   115.1   115.1
Total net assets acquired $ 355.5   $ 355.5   $ 355.5
Number of companies acquired | acquisition     17