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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Jun. 30, 2022
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 18.4
Other current assets 72.0
Fixed assets 1.8
Noncurrent assets 9.2
Goodwill 213.6
Expiration lists 169.8
Non-compete agreements 10.8
Trade names 1.7
Total assets acquired 497.3
Current liabilities 73.9
Noncurrent liabilities 31.4
Total liabilities assumed 105.3
Total net assets acquired 392.0
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 54.4
Expiration lists 33.3
Non-compete agreements 4.1
Trade names 0.8
Total assets acquired 116.7
Current liabilities 15.3
Noncurrent liabilities 10.6
Total liabilities assumed 25.9
Total net assets acquired 90.8
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
Twelve Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 6.7
Other current assets 47.0
Fixed assets 0.9
Noncurrent assets 5.9
Goodwill 112.0
Expiration lists 101.5
Non-compete agreements 2.7
Trade names 0.1
Total assets acquired 276.8
Current liabilities 47.4
Noncurrent liabilities 13.6
Total liabilities assumed 61.0
Total net assets acquired $ 215.8