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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Mar. 31, 2021
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash $ 61.1
Other current assets 131.1
Fixed assets 4.5
Noncurrent assets 6.9
Goodwill 288.5
Expiration lists 196.4
Non-compete agreements 18.2
Trade names 3.2
Total assets acquired 709.9
Current liabilities 175.0
Noncurrent liabilities 33.0
Total liabilities assumed 208.0
Total net assets acquired 501.9
Bollington Wilson Group [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 24.9
Other current assets 15.2
Fixed assets 3.8
Noncurrent assets 5.3
Goodwill 223.0
Expiration lists 109.1
Non-compete agreements 16.1
Trade names 3.2
Total assets acquired 400.6
Current liabilities 39.6
Noncurrent liabilities 31.6
Total liabilities assumed 71.2
Total net assets acquired 329.4
Atlas General Holdings LLC [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 32.8
Other current assets 112.0
Fixed assets 0.7
Noncurrent assets 1.2
Goodwill 34.8
Expiration lists 56.4
Non-compete agreements 1.4
Total assets acquired 239.3
Current liabilities 129.8
Noncurrent liabilities 0.2
Total liabilities assumed 130.0
Total net assets acquired 109.3
Four Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash and restricted cash 3.4
Other current assets 3.9
Noncurrent assets 0.4
Goodwill 30.7
Expiration lists 30.9
Non-compete agreements 0.7
Total assets acquired 70.0
Current liabilities 5.6
Noncurrent liabilities 1.2
Total liabilities assumed 6.8
Total net assets acquired $ 63.2