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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