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Business Combinations - Additional Information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) Acquisition | Dec. 31, 2019 USD ($) Acquisition | Dec. 31, 2018 USD ($) Acquisition | Dec. 12, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition | 25 | 27 |  |  |
Aggregate purchase price of acquisitions | $ (3,500,000) | $ 4,100,000 | $ 21,400 |  |
Payments to Acquire Businesses, Gross | 722,515,000 | 356,260,000 | 934,928,000 |  |
Goodwill, Acquired During Period | 648,095,000 | 328,546,000 | 717,700,000 |  |
Goodwill currently deductible for income tax purposes | 516,700,000 | 245,600,000 | 640,300,000 |  |
Goodwill related to the recorded earn-out payables | 131,400,000 | 82,900,000 | 77,400,000 |  |
Total revenues related to acquisitions | 93,900,000 | 49,100,000 | 82,400,000 |  |
Income before income taxes related to acquisitions | 7,500,000 | 3,400,000 | 6,300,000 |  |
Maximum Future Contingency payments Acquisitions | 544,700,000 |  |  |  |
Estimated acquisition earn-out payables | 258,943,000 | 161,513,000 | 89,924,000 | $ 89,900,000 | $ 36,175,000
Other Noncurrent Liabilities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 179,700,000 | 143,600,000 |  | 68,800,000 |
Accounts payable |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated acquisition earn-out payables | 79,200,000 | 17,900,000 |  | $ 21,100,000 |
Retail |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period | 299,961,000 | 302,640,000 | 676,900,000 |  |
National Programs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period | 163,070,000 | 74,000 | 18,700,000 |  |
Wholesale Brokerage |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period | 184,956,000 | 6,479,000 | 5,500,000 |  |
Services |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill, Acquired During Period | 108,000 | 19,353,000 |  |  |
Goodwill adjusted amount | $ 100,000 | $ 19,300,000 | $ 16,500,000 |  |
Purchased Customer Accounts |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average life (years) | 15 years | 15 years | 15 years |  |
Non-compete Agreements |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average life (years) | 5 years | 5 years | 5 years |  |
Business Combinations - Asset Deals |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition | 20 | 22 | 20 |  |
Business Combinations - Stock Deals |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition | 1 | 1 | 3 |  |
Book of Business Purchases |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquisitions | Acquisition | 4 | 4 | 1 |  |

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