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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 3.7
Other current assets 40.6
Fixed assets 1.9
Noncurrent assets 5.5
Goodwill 131.5
Expiration lists 130.6
Non-compete agreements 2.1
Total assets acquired 315.9
Current liabilities 43.5
Total liabilities assumed 48.1
Total net assets acquired 267.8
Inverson Holding Company - Company, LLC (IHC) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 3.8
Fixed assets 0.3
Noncurrent assets 0.5
Goodwill 41.8
Expiration lists 50.6
Non-compete agreements 1.1
Total assets acquired 98.1
Current liabilities 5.1
Total liabilities assumed 5.6
Total net assets acquired 92.5
James Brown Inc. (JBI) [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 2.7
Other current assets 22.2
Fixed assets 1.1
Noncurrent assets 2.9
Goodwill 51.2
Expiration lists 22.7
Non-compete agreements 0.8
Total assets acquired 103.6
Current liabilities 26.1
Total liabilities assumed 29.0
Total net assets acquired 74.6
Nine Other Acquisition [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 1.0
Other current assets 14.6
Fixed assets 0.5
Noncurrent assets 2.1
Goodwill 38.5
Expiration lists 57.3
Non-compete agreements 0.2
Total assets acquired 114.2
Current liabilities 12.3
Total liabilities assumed 13.5
Total net assets acquired $ 100.7