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Business Combinations - Segment Allocation (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | $ 740,743 | $ 683,083 | $ 588,213
Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 60,446 | 97,439 |
Financial Services |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 426,685 | 368,039 | 334,247
Financial Services | Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 58,646 | 34,785 |
Total | 99,732 | 35,270 |
Financial Services | Series of Individually Immaterial Business Acquisitions | Client lists |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Intangibles | 40,950 | 0 |
Financial Services | Series of Individually Immaterial Business Acquisitions | Other intangibles |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Intangibles | 136 | 485 |
Benefits and Insurance Services |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 312,392 | 313,378 | $ 252,300
Benefits and Insurance Services | Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Goodwill | 1,800 | 62,654 |
Total | 3,136 | 82,872 |
Benefits and Insurance Services | Series of Individually Immaterial Business Acquisitions | Client lists |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Intangibles | 1,290 | 19,350 |
Benefits and Insurance Services | Series of Individually Immaterial Business Acquisitions | Other intangibles |  |  |
Business Combination Segment Allocation [Line Items] |  |  |
Intangibles | $ 46 | $ 868 |

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