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Business Combinations - Purchase Price Allocation for Current Year Acquisitions and Adjustments Made for Prior Year Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Mar. 31, 2021 | Sep. 30, 2022
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Cash paid |  |  | $ 2,504.7
Common stock issued | $ 14.7 | $ 4.9 | 14.7
Other payable |  |  | 4.6
Recorded earn-out payable |  |  | 42.1
Net assets acquired | 2,566.1 |  | 2,566.1
Orchid Intermediate Holdings L P |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired | 487.0 |  | $ 487.0
Orchid Intermediate Holdings L P | National Programs |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Effective date of acquisition |  |  | Mar. 31, 2022
Cash paid |  |  | $ 476.2
Common stock issued |  |  | 0.0
Other payable |  |  | 0.0
Recorded earn-out payable |  |  | 10.8
Net assets acquired | 487.0 |  | 487.0
Maximum potential earn- out payable | 20.0 |  | 20.0
GRP (Jersey) Holdco Limited (GRP) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired | 1,854.5 |  | $ 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
Other payable |  |  | 0.0
Recorded earn-out payable |  |  | 0.0
Net assets acquired | 1,854.5 |  | 1,854.5
Maximum potential earn- out payable | 0.0 |  | 0.0
First Insurance Solutions Ltd. (First) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired | 22.7 |  | $ 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
Common stock issued |  |  | 0.0
Other payable |  |  | 1.4
Recorded earn-out payable |  |  | 8.3
Net assets acquired | 22.7 |  | 22.7
Maximum potential earn- out payable | 8.4 |  | 8.4
BdB Holdings Limited (BdB) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired | 86.7 |  | $ 86.7
BdB Holdings Limited (BdB) | Wholesale |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Effective date of acquisition |  |  | Aug. 01, 2022
Cash paid |  |  | $ 75.3
Common stock issued |  |  | 0.0
Other payable |  |  | 0.0
Recorded earn-out payable |  |  | 11.4
Net assets acquired | 86.7 |  | 86.7
Maximum potential earn- out payable | 36.3 |  | 36.3
Smithwick & Mariners Insurance, Inc. (Smithwick) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired | 25.8 |  | $ 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
Common stock issued |  |  | 0.0
Other payable |  |  | 1.0
Recorded earn-out payable |  |  | 1.6
Net assets acquired | 25.8 |  | 25.8
Maximum potential earn- out payable | 6.5 |  | 6.5
VistaNational Insurance Group, Inc. (VistaNational) |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Net assets acquired | 28.6 |  | $ 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
Common stock issued |  |  | 0.0
Other payable |  |  | 0.8
Recorded earn-out payable |  |  | 1.1
Net assets acquired | 28.6 |  | 28.6
Maximum potential earn- out payable | 3.0 |  | 3.0
Other Acquisitions | Various |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Cash paid |  |  | 50.5
Common stock issued |  |  | 0.0
Other payable |  |  | 1.4
Recorded earn-out payable |  |  | 8.9
Net assets acquired | 60.8 |  | 60.8
Maximum potential earn- out payable | 17.9 |  | 17.9
2022 Acquisition |  |  |
Business Combination Separately Recognized Transactions [Line Items] |  |  |
Maximum potential earn- out payable | $ 92.1 |  | $ 92.1

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