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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 25.9
Other current assets 144.0
Fixed assets 7.2
Noncurrent assets 35.4
Goodwill 756.1
Expiration lists 527.5
Non-compete agreements 21.1
Trade names 2.5
Total assets acquired 1,519.7
Current liabilities 191.2
Non-current liabilities 55.9
Total liabilities assumed 247.1
Total net assets acquired 1,272.6
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
Non-current liabilities 0.5
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 49.5
Expiration lists 25.4
Non-compete agreements 0.1
Trade names 0.1
Total assets acquired 104.0
Current liabilities 20.4
Non-current liabilities 9.0
Total liabilities assumed 29.4
Total net assets acquired 74.6
Stackhouse Poland Group [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 13.6
Other current assets 35.9
Fixed assets 3.1
Noncurrent assets 9.9
Goodwill 302.6
Expiration lists 56.8
Non-compete agreements 11.4
Total assets acquired 433.3
Current liabilities 78.5
Non-current liabilities 23.2
Total liabilities assumed 101.7
Total net assets acquired 331.6
RPA Insurance Services LLC [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 10.6
Fixed assets 0.2
Noncurrent assets 0.7
Goodwill 34.5
Expiration lists 32.6
Non-compete agreements 0.1
Total assets acquired 78.7
Current liabilities 13.2
Non-current liabilities 0.7
Total liabilities assumed 13.9
Total net assets acquired 64.8
JLT Aerospace [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 6.3
Noncurrent assets 2.9
Goodwill 106.2
Expiration lists 118.8
Non-compete agreements 2.4
Trade names 2.3
Total assets acquired 238.9
Current liabilities 12.5
Total liabilities assumed 12.5
Total net assets acquired 226.4
RGA Group [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 6.0
Other current assets 5.1
Fixed assets 0.2
Noncurrent assets 5.7
Goodwill 36.7
Expiration lists 19.5
Non-compete agreements 2.7
Total assets acquired 75.9
Current liabilities 10.6
Non-current liabilities 3.8
Total liabilities assumed 14.4
Total net assets acquired 61.5
Thirty Two Other Acquisition [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 3.6
Other current assets 60.1
Fixed assets 2.3
Noncurrent assets 12.8
Goodwill 184.8
Expiration lists 223.8
Non-compete agreements 3.3
Trade names 0.1
Total assets acquired 490.8
Current liabilities 50.9
Non-current liabilities 18.7
Total liabilities assumed 69.6
Total net assets acquired $ 421.2