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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant non-cash investing and financing activities |  |  |
Other payables issued for agency acquisitions and purchased customer accounts | $ 12.2 | $ 5.6 | $ 15.1
Estimated acquisition earn-out payables and related charges | 67.2 | 73.3 | 75.7
Assumed acquisition earn-out payables | 21.1 | 34.8 |
Contingent payable issued for agency acquisition |  |  | 24.1
Common stock issued for agency acquisition | 18.3 | 14.7 | 9.9
Notes payable assumed for agency acquisition |  | $ 1.8 | $ 1.4
Notes received on the sale of businesses, fixed assets and customer accounts | $ 0.1 |  |

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- Definition Contingent payable issued for agency acquisition. + References No definition available. + Details
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- Definition The amount of payables that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-5 + Details
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