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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2023
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 65.7
Fiduciary assets 61.7
Other current assets 91.4
Fixed assets 38.4
Noncurrent assets 75.1
Goodwill 957.9
Expiration lists 667.9
Non-compete agreements 15.6
Trade names 4.2
Total assets acquired 1,977.9
Fiduciary liabilities 61.7
Current liabilities 75.6
Noncurrent liabilities 182.8
Total liabilities assumed 320.1
Total net assets acquired 1,657.8
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
BCHR [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 25.8
Other current assets 60.9
Fixed assets 36.8
Noncurrent assets 53.2
Goodwill 395.8
Expiration lists 202.4
Trade names 2.6
Total assets acquired 777.5
Current liabilities 53.0
Noncurrent liabilities 103.7
Total liabilities assumed 156.7
Total net assets acquired 620.8
BFH [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 0.6
Fiduciary assets 3.7
Other current assets 1.4
Noncurrent assets 0.2
Goodwill 38.5
Expiration lists 37.4
Non-compete agreements 0.4
Total assets acquired 82.2
Fiduciary liabilities 3.7
Current liabilities 0.6
Noncurrent liabilities 10.0
Total liabilities assumed 14.3
Total net assets acquired 67.9
TRH [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 5.3
Other current assets 8.3
Noncurrent assets 0.3
Goodwill 50.0
Expiration lists 22.0
Non-compete agreements 2.2
Total assets acquired 88.1
Current liabilities 2.6
Noncurrent liabilities 6.1
Total liabilities assumed 8.7
Total net assets acquired 79.4
IKB [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 2.0
Fiduciary assets 0.5
Other current assets 2.6
Fixed assets 0.1
Noncurrent assets 0.5
Goodwill 43.8
Expiration lists 30.4
Non-compete agreements 0.2
Total assets acquired 80.1
Fiduciary liabilities 0.5
Current liabilities 1.7
Noncurrent liabilities 8.3
Total liabilities assumed 10.5
Total net assets acquired 69.6
RHP [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Fiduciary assets 3.0
Other current assets 1.5
Noncurrent assets 0.3
Goodwill 49.6
Expiration lists 34.0
Non-compete agreements 0.2
Total assets acquired 88.6
Fiduciary liabilities 3.0
Current liabilities 1.2
Noncurrent liabilities 9.1
Total liabilities assumed 13.3
Total net assets acquired 75.3
Thirty-one Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 19.0
Fiduciary assets 40.7
Other current assets 15.2
Fixed assets 0.7
Noncurrent assets 12.0
Goodwill 321.4
Expiration lists 314.2
Non-compete agreements 8.3
Trade names 1.6
Total assets acquired 733.1
Fiduciary liabilities 40.7
Current liabilities 12.6
Noncurrent liabilities 32.6
Total liabilities assumed 85.9
Total net assets acquired $ 647.2