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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Jun. 30, 2023
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 53.4
Fiduciary assets 36.5
Other current assets 81.9
Fixed assets 37.8
Noncurrent assets 73.2
Goodwill 858.7
Expiration lists 549.9
Non-compete agreements 11.4
Trade names 3.9
Total assets acquired 1,706.7
Fiduciary liabilities 36.5
Current liabilities 68.4
Noncurrent liabilities 172.9
Total liabilities assumed 277.8
Total net assets acquired 1,428.9
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 36.7
Noncurrent assets 53.2
Goodwill 419.3
Expiration lists 203.3
Trade names 2.6
Total assets acquired 801.8
Current liabilities 53.0
Noncurrent liabilities 103.8
Total liabilities assumed 156.8
Total net assets acquired 645.0
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 46.4
Expiration lists 30.4
Non-compete agreements 0.2
Total assets acquired 82.7
Fiduciary liabilities 0.5
Current liabilities 1.7
Noncurrent liabilities 8.3
Total liabilities assumed 10.5
Total net assets acquired 72.2
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
Nineteen Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 6.7
Fiduciary assets 15.5
Other current assets 5.7
Fixed assets 0.2
Noncurrent assets 10.1
Goodwill 196.1
Expiration lists 195.3
Non-compete agreements 4.1
Trade names 1.3
Total assets acquired 435.0
Fiduciary liabilities 15.5
Current liabilities 5.4
Noncurrent liabilities 22.6
Total liabilities assumed 43.5
Total net assets acquired $ 391.5