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Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Combination Separately Recognized Transactions [Line Items]      
Cash paid $ 2,544.4 $ 424.6  
Common stock issued 14.7 9.9 $ 30.1
Net assets acquired 2,638.0 549.4 $ 893.2
Orchid Underwriters Agency, LLC (Orchid)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 487.0    
Orchid Underwriters Agency, LLC (Orchid) | National Programs      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Mar. 31, 2022    
Cash paid $ 476.2    
Recorded earn-out payable 10.8    
Net assets acquired 487.0    
Maximum potential earn- out payable 20.0    
GRP (Jersey) Holdco Limited (GRP)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 1,854.5    
GRP (Jersey) Holdco Limited (GRP) | Retail National Programs Wholesale      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Jul. 01, 2022    
Cash paid $ 1,839.8    
Common stock issued 14.7    
Net assets acquired 1,854.5    
First Insurance Solutions Ltd. (First)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 22.7    
First Insurance Solutions Ltd. (First) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Jul. 08, 2022    
Cash paid $ 13.0    
Other payable 1.4    
Recorded earn-out payable 8.3    
Net assets acquired 22.7    
Maximum potential earn- out payable 9.2    
BdB Holdings Limited (BdB)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 86.4    
BdB Holdings Limited (BdB) | Wholesale      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Aug. 01, 2022    
Cash paid $ 75.3    
Recorded earn-out payable 11.1    
Net assets acquired 86.4    
Maximum potential earn- out payable 36.3    
Smithwick & Mariners Insurance, Inc. (Smithwick)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 25.8    
Smithwick & Mariners Insurance, Inc. (Smithwick) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Sep. 01, 2022    
Cash paid $ 23.2    
Other payable 1.0    
Recorded earn-out payable 1.6    
Net assets acquired 25.8    
Maximum potential earn- out payable 6.5    
VistaNational Insurance Group, Inc. (VistaNational)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 28.6    
VistaNational Insurance Group, Inc. (VistaNational) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Sep. 01, 2022    
Cash paid $ 26.7    
Other payable 0.8    
Recorded earn-out payable 1.1    
Net assets acquired 28.6    
Maximum potential earn- out payable 3.0    
Taylor Berry Knight Limited (Taylor)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired $ 45.1    
Taylor Berry Knight Limited (Taylor) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition Nov. 16, 2022    
Cash paid $ 27.1    
Other payable 0.2    
Recorded earn-out payable 17.8    
Net assets acquired 45.1    
Maximum potential earn- out payable 17.8    
O'Leary Insurances (O'Leary)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 137.7  
O'Leary Insurances (O'Leary) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Jan. 01, 2021  
Cash paid   $ 117.4  
Common stock issued   4.9  
Recorded earn-out payable   15.4  
Net assets acquired   137.7  
Maximum potential earn- out payable   30.6  
Piper Jordan LLC (Piper)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 54.7  
Piper Jordan LLC (Piper) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   May 01, 2021  
Cash paid   $ 43.4  
Other payable   1.4  
Recorded earn-out payable   9.9  
Net assets acquired   54.7  
Maximum potential earn- out payable   15.0  
Berkshire Insurance Group, Inc. (Berkshire)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 41.5  
Berkshire Insurance Group, Inc. (Berkshire) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Sep. 01, 2021  
Cash paid   $ 41.5  
Net assets acquired   41.5  
AGIS Network, Inc. (AGIS)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 36.1  
AGIS Network, Inc. (AGIS) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Sep. 01, 2021  
Cash paid   $ 11.2  
Other payable   24.1  
Recorded earn-out payable   0.8  
Net assets acquired   36.1  
Maximum potential earn- out payable   12.3  
Winston Financial Services, Inc. (Winston)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 108.6  
Winston Financial Services, Inc. (Winston) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Oct. 01, 2021  
Cash paid   $ 79.5  
Common stock issued   5.0  
Other payable   7.7  
Recorded earn-out payable   16.4  
Net assets acquired   108.6  
Maximum potential earn- out payable   29.0  
Remedy Analytics, Inc. (Remedy)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 48.6  
Remedy Analytics, Inc. (Remedy) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Oct. 01, 2021  
Cash paid   $ 40.8  
Other payable   0.5  
Recorded earn-out payable   7.3  
Net assets acquired   48.6  
Maximum potential earn- out payable   25.0  
Heacock Insurance Group, LLC (Heacock)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 20.6  
Heacock Insurance Group, LLC (Heacock) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Oct. 01, 2021  
Cash paid   $ 18.2  
Other payable   0.5  
Recorded earn-out payable   1.9  
Net assets acquired   20.6  
Maximum potential earn- out payable   6.0  
Corporate Insurance Advisors, L.L.C. (CIA)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 22.0  
Corporate Insurance Advisors, L.L.C. (CIA) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Dec. 01, 2021  
Cash paid   $ 15.3  
Other payable   0.2  
Recorded earn-out payable   6.5  
Net assets acquired   22.0  
Maximum potential earn- out payable   14.0  
Rainmaker Advisory, LLC (Rainmaker)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 20.8  
Rainmaker Advisory, LLC (Rainmaker) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Dec. 01, 2021  
Cash paid   $ 14.2  
Other payable   0.7  
Recorded earn-out payable   5.9  
Net assets acquired   20.8  
Maximum potential earn- out payable   10.0  
HARCO Insurance Services, Inc. (HARCO)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   $ 29.7  
HARCO Insurance Services, Inc. (HARCO) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition   Dec. 31, 2021  
Cash paid   $ 24.3  
Other payable   1.0  
Recorded earn-out payable   4.4  
Net assets acquired   29.7  
Maximum potential earn- out payable   7.3  
Special Risk Insurance Managers Ltd. (Special Risk) | National Programs      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Jan. 01, 2020
Cash paid     $ 70.2
Recorded earn-out payable     9.8
Net assets acquired     80.0
Maximum potential earn- out payable     14.7
Texas All Risk General Agency, Inc. et al (Texas Risk)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 11.0
Texas All Risk General Agency, Inc. et al (Texas Risk) | Wholesale Brokerage      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Jan. 01, 2020
Cash paid     $ 10.5
Other payable     0.2
Recorded earn-out payable     0.3
Net assets acquired     11.0
Maximum potential earn- out payable     1.2
The Colonial Group, Inc. et al (Colonial)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 37.1
The Colonial Group, Inc. et al (Colonial) | Wholesale Brokerage      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Mar. 01, 2020
Cash paid     $ 29.0
Other payable     0.5
Recorded earn-out payable     7.6
Net assets acquired     37.1
Maximum potential earn- out payable     10.2
RLA Insurance Intermediaries, LLC (RLA)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 55.0
RLA Insurance Intermediaries, LLC (RLA) | Wholesale Brokerage      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Mar. 01, 2020
Cash paid     $ 42.5
Other payable     0.8
Recorded earn-out payable     11.7
Net assets acquired     55.0
Maximum potential earn- out payable     22.5
Dealer Financial Services of N.C., LLC d/b/a The Sterling Group (Sterling)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 23.7
Dealer Financial Services of N.C., LLC d/b/a The Sterling Group (Sterling) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Apr. 01, 2020
Cash paid     $ 19.3
Other payable     0.3
Recorded earn-out payable     4.1
Net assets acquired     23.7
Maximum potential earn- out payable     5.4
LP Insurance Services, LLC (LP)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 149.7
LP Insurance Services, LLC (LP) | National Programs      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     May 01, 2020
Cash paid     $ 116.0
Common stock issued     10.0
Other payable     0.3
Recorded earn-out payable     23.4
Net assets acquired     149.7
Maximum potential earn- out payable     75.8
First Resource, Inc. (First)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 14.9
First Resource, Inc. (First) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Jul. 01, 2020
Cash paid     $ 10.7
Other payable     0.4
Recorded earn-out payable     3.8
Net assets acquired     14.9
Maximum potential earn- out payable     5.8
Buiten & Associates, LLC (Buiten)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 46.8
Buiten & Associates, LLC (Buiten) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Aug. 01, 2020
Cash paid     $ 38.2
Other payable     1.2
Recorded earn-out payable     7.4
Net assets acquired     46.8
Maximum potential earn- out payable     14.2
Amity Insurance, Inc. (Amity)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 18.9
Amity Insurance, Inc. (Amity) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Aug. 01, 2020
Cash paid     $ 14.8
Common stock issued     2.0
Other payable     0.2
Recorded earn-out payable     1.9
Net assets acquired     18.9
Maximum potential earn- out payable     4.0
Frank E. Neal & Co., Inc. (Neal)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 41.8
Frank E. Neal & Co., Inc. (Neal) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Sep. 01, 2020
Cash paid     $ 32.6
Common stock issued     3.1
Other payable     0.4
Recorded earn-out payable     5.7
Net assets acquired     41.8
Maximum potential earn- out payable     10.3
BrookStone Insurance Group, LLC (BrookStone)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 13.1
BrookStone Insurance Group, LLC (BrookStone) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Sep. 01, 2020
Cash paid     $ 12.0
Recorded earn-out payable     1.1
Net assets acquired     13.1
Maximum potential earn- out payable     1.9
VAS GenPar, LLC (VAS)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 152.6
VAS GenPar, LLC (VAS) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Oct. 01, 2020
Cash paid     $ 114.3
Common stock issued     15.0
Recorded earn-out payable     23.3
Net assets acquired     152.6
Maximum potential earn- out payable     48.0
Bright & Associates, Inc. (Bright)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 17.6
Bright & Associates, Inc. (Bright) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Oct. 01, 2020
Cash paid     $ 12.5
Other payable     1.2
Recorded earn-out payable     3.9
Net assets acquired     17.6
Maximum potential earn- out payable     5.8
J.E. Brown & Associates Insurance Services, Inc. (J.E. Brown)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 40.3
J.E. Brown & Associates Insurance Services, Inc. (J.E. Brown) | Wholesale Brokerage      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Oct. 01, 2020
Cash paid     $ 33.3
Other payable     1.0
Recorded earn-out payable     6.0
Net assets acquired     40.3
Maximum potential earn- out payable     10.4
CoverHound, Inc. and CyberPolicy, Inc. (CoverHound)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 28.2
CoverHound, Inc. and CyberPolicy, Inc. (CoverHound) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Nov. 01, 2020
Cash paid     $ 27.6
Other payable     0.6
Net assets acquired     28.2
MAJ Companies, Ltd. (MAJ)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 21.4
MAJ Companies, Ltd. (MAJ) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Dec. 01, 2020
Cash paid     $ 19.1
Other payable     0.3
Recorded earn-out payable     2.0
Net assets acquired     21.4
Maximum potential earn- out payable     6.5
South & Western General Agency, Inc. (South & Western)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 78.2
South & Western General Agency, Inc. (South & Western) | Wholesale Brokerage      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Dec. 01, 2020
Cash paid     $ 69.7
Other payable     1.2
Recorded earn-out payable     7.3
Net assets acquired     78.2
Maximum potential earn- out payable     18.0
Berry Insurance Group, Inc. (Berry)      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired     $ 39.0
Berry Insurance Group, Inc. (Berry) | Retail      
Business Combination Separately Recognized Transactions [Line Items]      
Effective date of acquisition     Dec. 31, 2020
Cash paid     $ 35.3
Recorded earn-out payable     3.7
Net assets acquired     39.0
Maximum potential earn- out payable     6.5
2022 Acquisition      
Business Combination Separately Recognized Transactions [Line Items]      
Cash paid 2,544.4    
Common stock issued 14.7    
Other payable 5.6    
Recorded earn-out payable 73.3    
Net assets acquired 2,638.0    
Maximum potential earn- out payable 112.4    
Other Acquisitions      
Business Combination Separately Recognized Transactions [Line Items]      
Net assets acquired   29.1 23.9
Other Acquisitions | Various      
Business Combination Separately Recognized Transactions [Line Items]      
Cash paid 63.1 18.8 14.9
Other payable 2.2 3.1 0.5
Recorded earn-out payable 22.6 7.2 8.5
Net assets acquired 87.9 29.1 23.9
Maximum potential earn- out payable $ 19.6 13.1 12.3
2021 Acquisition      
Business Combination Separately Recognized Transactions [Line Items]      
Cash paid   424.6  
Common stock issued   9.9  
Other payable   39.2  
Recorded earn-out payable   75.7  
Net assets acquired   549.4  
Maximum potential earn- out payable   $ 162.3  
2020 Acquisition      
Business Combination Separately Recognized Transactions [Line Items]      
Cash paid     722.5
Common stock issued     30.1
Other payable     9.1
Recorded earn-out payable     131.5
Net assets acquired     893.2
Maximum potential earn- out payable     $ 273.5