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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 4.3
Other current assets 45.7
Fixed assets 0.5
Noncurrent assets 11.2
Goodwill 200.7
Expiration lists 229.2
Non-compete agreements 3.6
Trade names 5.0
Total assets acquired 500.2
Current liabilities 43.6
Noncurrent liabilities 6.8
Total liabilities assumed 50.4
Total net assets acquired 449.8
CRES [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 1.5
Other current assets 15.2
Goodwill 21.3
Expiration lists 13.9
Trade names 0.3
Total assets acquired 52.2
Current liabilities 15.7
Total liabilities assumed 15.7
Total net assets acquired 36.5
CRB [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Noncurrent assets 7.6
Goodwill 108.4
Expiration lists 133.7
Non-compete agreements 2.9
Trade names 4.7
Total assets acquired 257.3
Total net assets acquired 257.3
HES [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 0.3
Other current assets 4.0
Noncurrent assets 0.8
Goodwill 19.1
Expiration lists 13.7
Non-compete agreements 0.1
Total assets acquired 38.0
Current liabilities 4.4
Noncurrent liabilities 0.5
Total liabilities assumed 4.9
Total net assets acquired 33.1
Fourteen Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 2.5
Other current assets 26.5
Fixed assets 0.5
Noncurrent assets 2.8
Goodwill 51.9
Expiration lists 67.9
Non-compete agreements 0.6
Total assets acquired 152.7
Current liabilities 23.5
Noncurrent liabilities 6.3
Total liabilities assumed 29.8
Total net assets acquired $ 122.9