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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Jun. 30, 2020
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 4.2
Other current assets 40.9
Fixed assets 0.4
Noncurrent assets 10.4
Goodwill 190.5
Expiration lists 178.4
Non-compete agreements 4.6
Trade names 14.2
Total assets acquired 443.6
Current liabilities 39.7
Noncurrent liabilities 4.1
Total liabilities assumed 43.8
Total net assets acquired 399.8
CRES [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 1.5
Other current assets 15.2
Goodwill 24.6
Expiration lists 9.3
Non-compete agreements 0.4
Trade names 1.0
Total assets acquired 52.0
Current liabilities 15.7
Total liabilities assumed 15.7
Total net assets acquired 36.3
CRB [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Noncurrent assets 7.6
Goodwill 119.0
Expiration lists 103.3
Non-compete agreements 3.3
Trade names 13.2
Total assets acquired 246.4
Total net assets acquired 246.4
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 13.1
Expiration lists 19.5
Non-compete agreements 0.5
Total assets acquired 38.2
Current liabilities 4.4
Noncurrent liabilities 0.5
Total liabilities assumed 4.9
Total net assets acquired 33.3
Nine Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 2.4
Other current assets 21.7
Fixed assets 0.4
Noncurrent assets 2.0
Goodwill 33.8
Expiration lists 46.3
Non-compete agreements 0.4
Total assets acquired 107.0
Current liabilities 19.6
Noncurrent liabilities 3.6
Total liabilities assumed 23.2
Total net assets acquired $ 83.8