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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 285 Months Ended
Sep. 30, 2025
USD ($)
acquisition
Sep. 30, 2024
acquisition
Sep. 30, 2025
USD ($)
acquisition
Sep. 30, 2024
acquisition
Sep. 30, 2025
USD ($)
company
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents $ 264.3   $ 264.3   $ 264.3
Fiduciary assets 1,718.7   1,718.7   1,718.7
Other current assets 1,148.9   1,148.9   1,148.9
Fixed assets 151.6   151.6   151.6
Noncurrent assets 264.9   264.9   264.9
Goodwill 9,539.9   9,539.9   9,539.9
Expiration lists 6,774.6   6,774.6   6,774.6
Non-compete agreements 11.9   11.9   11.9
Trade names 37.5   37.5   37.5
Total assets acquired 19,912.3   19,912.3   19,912.3
Fiduciary liabilities 1,718.7   1,718.7   1,718.7
Current liabilities 937.1   937.1   937.1
Noncurrent liabilities 1,448.1   1,448.1   1,448.1
Total liabilities assumed 4,103.9   4,103.9   4,103.9
Total net assets acquired $ 15,808.4   $ 15,808.4   $ 15,808.4
Number of companies acquired 41 29 82 74 776
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 2.8   2.8   2.8
Noncurrent assets 2.2   2.2   2.2
Goodwill 99.6   99.6   99.6
Expiration lists 53.6   53.6   53.6
Non-compete agreements 0.0   0.0   0.0
Trade names 2.2   2.2   2.2
Total assets acquired 269.2   269.2   269.2
Fiduciary liabilities 86.8   86.8   86.8
Current liabilities 11.8   11.8   11.8
Noncurrent liabilities 16.0   16.0   16.0
Total liabilities assumed 114.6   114.6   114.6
Total net assets acquired 154.6   154.6   154.6
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 0.3   0.3   0.3
Goodwill 49.5   49.5   49.5
Expiration lists 36.2   36.2   36.2
Non-compete agreements 7.3   7.3   7.3
Trade names 0.0   0.0   0.0
Total assets acquired 103.9   103.9   103.9
Fiduciary liabilities 0.0   0.0   0.0
Current liabilities 7.3   7.3   7.3
Noncurrent liabilities 13.8   13.8   13.8
Total liabilities assumed 21.1   21.1   21.1
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 77.9   77.9   77.9
Fixed assets 12.8   12.8   12.8
Noncurrent assets 25.1   25.1   25.1
Goodwill 811.9   811.9   811.9
Expiration lists 459.2   459.2   459.2
Non-compete agreements 0.0   0.0   0.0
Trade names 8.4   8.4   8.4
Total assets acquired 1,922.5   1,922.5   1,922.5
Fiduciary liabilities 465.3   465.3   465.3
Current liabilities 35.2   35.2   35.2
Noncurrent liabilities 147.7   147.7   147.7
Total liabilities assumed 648.2   648.2   648.2
Total net assets acquired 1,274.3   1,274.3   1,274.3
APG          
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents 165.7   165.7   165.7
Fiduciary assets 1,123.8   1,123.8   1,123.8
Other current assets 1,037.2   1,037.2   1,037.2
Fixed assets 133.9   133.9   133.9
Noncurrent assets 234.1   234.1   234.1
Goodwill 8,276.4   8,276.4   8,276.4
Expiration lists 5,993.3   5,993.3   5,993.3
Non-compete agreements 0.0   0.0   0.0
Trade names 26.9   26.9   26.9
Total assets acquired 16,991.3   16,991.3   16,991.3
Fiduciary liabilities 1,123.8   1,123.8   1,123.8
Current liabilities 867.8   867.8   867.8
Noncurrent liabilities 1,219.8   1,219.8   1,219.8
Total liabilities assumed 3,211.4   3,211.4   3,211.4
Total net assets acquired 13,779.9   13,779.9   13,779.9
Twenty-two Other Acquisitions          
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]          
Cash and cash equivalents 25.8   25.8   25.8
Fiduciary assets 42.8   42.8   42.8
Other current assets 13.1   13.1   13.1
Fixed assets 1.1   1.1   1.1
Noncurrent assets 3.2   3.2   3.2
Goodwill 302.5   302.5   302.5
Expiration lists 232.3   232.3   232.3
Non-compete agreements 4.6   4.6   4.6
Trade names 0.0   0.0   0.0
Total assets acquired 625.4   625.4   625.4
Fiduciary liabilities 42.8   42.8   42.8
Current liabilities 15.0   15.0   15.0
Noncurrent liabilities 50.8   50.8   50.8
Total liabilities assumed 108.6   108.6   108.6
Total net assets acquired $ 516.8   $ 516.8   $ 516.8
Number of companies acquired | acquisition     22