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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Dec. 31, 2022
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 51.5
Other current assets 126.6
Fixed assets 3.2
Noncurrent assets 17.5
Goodwill 709.9
Expiration lists 564.0
Non-compete agreements 19.5
Trade names 6.1
Total assets acquired 1,498.3
Current liabilities 150.3
Noncurrent liabilities 45.0
Total liabilities assumed 195.3
Total net assets acquired 1,303.0
DIS [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 3.9
Other current assets 18.5
Fixed assets 0.4
Noncurrent assets 1.3
Goodwill 60.4
Expiration lists 29.0
Non-compete agreements 0.7
Trade names 0.9
Total assets acquired 115.1
Current liabilities 15.3
Noncurrent liabilities 8.9
Total liabilities assumed 24.2
Total net assets acquired 90.9
IGH [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 7.8
Other current assets 6.5
Fixed assets 0.5
Noncurrent assets 2.0
Goodwill 47.2
Expiration lists 35.0
Non-compete agreements 4.0
Trade names 0.8
Total assets acquired 103.8
Current liabilities 11.2
Noncurrent liabilities 7.2
Total liabilities assumed 18.4
Total net assets acquired 85.4
F3 Companies [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 0.1
Noncurrent assets 1.8
Goodwill 40.5
Expiration lists 65.1
Non-compete agreements 0.2
Total assets acquired 107.7
Current liabilities 0.3
Noncurrent liabilities 1.5
Total liabilities assumed 1.8
Total net assets acquired 105.9
M&T  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 6.1
Other current assets 27.6
Fixed assets 0.2
Noncurrent assets 1.4
Goodwill 87.0
Expiration lists 78.9
Non-compete agreements 0.9
Total assets acquired 202.1
Current liabilities 30.2
Noncurrent liabilities 0.9
Total liabilities assumed 31.1
Total net assets acquired 171.0
PIU  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 2.8
Goodwill 116.4
Expiration lists 44.6
Non-compete agreements 1.0
Trade names 4.0
Total assets acquired 168.8
Current liabilities 2.4
Total liabilities assumed 2.4
Total net assets acquired 166.4
Thirty-Two Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 30.9
Other current assets 73.9
Fixed assets 2.1
Noncurrent assets 11.0
Goodwill 358.4
Expiration lists 311.4
Non-compete agreements 12.7
Trade names 0.4
Total assets acquired 800.8
Current liabilities 90.9
Noncurrent liabilities 26.5
Total liabilities assumed 117.4
Total net assets acquired $ 683.4