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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Year
Summary Compensation Table Total for PEO (Joseph Zubretsky)(1)
($)
Compensation
Actually Paid to
PEO (Joseph Zubretsky)(1),(2),(3)
($)
Average Summary Compensation Table Total for
Non-PEO NEOs(1)
($)
Average Compensation Actually Paid to
Non-PEO NEOs(1),(2),(3)
($)
Value of Initial Fixed $100 Investment Based on:(4)
Net Income
($ Millions)
Adjusted Net Income per Diluted Share(5)
($)
TSR
($)		Peer Group TSR
($)
(a)(b)(c)(d)(e)(f)(g)(h)(i)
202421,944,109 15,398,868 5,427,204 3,759,320 214.50 158.26 1,179 22.65 
202321,491,723 25,202,450 4,707,296 2,881,779 266.28 151.60 1,091 20.88 
202222,131,256 41,668,352 5,392,703 9,278,192 243.36 148.16 792 17.92 
202119,961,698 75,905,547 4,196,221 10,545,861 234.42 132.62 659 13.54 
202017,812,327 58,165,935 4,428,117 8,983,969 156.74 100.14 673 10.67 
        
Company Selected Measure Name Adjusted EPS        
Named Executive Officers, Footnote Joseph Zubretsky was our PEO for each year presented. The individuals comprising the Non-PEO NEOs for each year presented are listed below.
20202021202220232024
Mark L. KeimMark L. KeimMark L. KeimMark L. KeimMark L. Keim
James E. WoysJames E. WoysJames E. WoysJames E. WoysJames E. Woys
Jeff D. BarlowJeff D. BarlowJeff D. BarlowJeff D. BarlowJeff D. Barlow
Marc S. RussoMarc S. RussoMarc S. RussoMaurice S. HebertDebra J. Bacon
Thomas L. TranThomas L. TranMarc S. Russo
        
Peer Group Issuers, Footnote The Peer Group TSR set forth in this table utilizes the peer companies (the “Compensation Peer Group”) used for compensation benchmarking purposes for the year 2024 (which is different than the peer group for year 2023), which is listed in our Compensation Discussion & Analysis section of the proxy statement. The peer group was updated to include relevant peers across business segment and certain financial metrics, including but not limited to criteria relevant to revenue, market capitalization, EBITDA, organization model, and employee recruitment. The Peer Group TSR is weighted according to the respective peer companies’ stock market capitalization on December 31, 2019. The comparison assumes $100 was invested for the period starting December 31, 2019, through the end of the listed year in the Company and in the Compensation Peer Group, respectively. Historical stock performance is not necessarily indicative of future stock performance.        
PEO Total Compensation Amount $ 21,944,109 $ 21,491,723 $ 22,131,256 $ 19,961,698 $ 17,812,327
PEO Actually Paid Compensation Amount $ 15,398,868 25,202,450 41,668,352 75,905,547 58,165,935
Adjustment To PEO Compensation, Footnote
YearSummary Compensation Table Total for
Joseph Zubretsky
($)		Exclusion of Change in Pension Value for
Joseph Zubretsky
($)		Exclusion of
Stock Awards for
Joseph Zubretsky
($)		Inclusion of
Equity Values for
Joseph Zubretsky
($)		Compensation
Actually Paid to
Joseph Zubretsky
($)
202421,944,109 — (16,200,092)9,654,851 15,398,868 
The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
YearYear-End Fair Value
of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for
Joseph Zubretsky
($)		Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Joseph Zubretsky
($)		Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Joseph Zubretsky
($)		Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Joseph Zubretsky
($)		Fair Value at
Last Day of
Prior Year of
Equity Awards Forfeited During Year for Joseph Zubretsky
($)		Total - Inclusion of Equity Values for Joseph Zubretsky
($)
202410,861,829 (3,584,702)— 2,377,724 — 9,654,851 
        
Non-PEO NEO Average Total Compensation Amount $ 5,427,204 4,707,296 5,392,703 4,196,221 4,428,117
Non-PEO NEO Average Compensation Actually Paid Amount $ 3,759,320 2,881,779 9,278,192 10,545,861 8,983,969
Adjustment to Non-PEO NEO Compensation Footnote
YearSummary Compensation Table Total for
Non-PEO NEOs
($)		Average Exclusion of Change in Pension Value for Non-PEO NEOs
($)		Average Exclusion of
Stock Awards for
Non-PEO NEOs
($)		Average Inclusion of
Equity Values for
Non-PEO NEOs
($)		Average Compensation Actually Paid to
Non-PEO NEOs
($)
20245,427,204 (44,898)(3,725,057)2,102,071 3,759,320 
YearAverage Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year for Non-PEO NEOs
($)		Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs
($)		Average Vesting-Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs
($) 		Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs
($)		Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs
($)		Total - Average Inclusion of Equity Values for Non-PEO NEOs
($)
20242,497,585 (735,220)— 339,706 — 2,102,071 
        
Compensation Actually Paid vs. Total Shareholder Return
The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and the Company’s cumulative TSR over the five most recently completed fiscal years.
3512
        
Compensation Actually Paid vs. Net Income
The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our net income during the five most recently completed fiscal years.
3841
        
Compensation Actually Paid vs. Company Selected Measure
The following chart sets forth the relationship between Compensation Actually Paid to our PEO, the average of Compensation Actually Paid to our other NEOs, and our Adjusted Net Income per Diluted Share during the five most recently completed fiscal years. The equity compensation actually paid to the PEO and NEOs was significantly impacted by stock price appreciation related both to the Company’s financial results and to its forward P/E multiple from significant actual and expected revenue growth.
4432
        
Total Shareholder Return Vs Peer Group
The following chart compares our cumulative TSR over the five most recently completed fiscal years to that of the 2024 Compensation Peer Group and 2023 Compensation Peer Group over the same period.
4661
        
Tabular List, Table
Performance Measures
Adjusted Net Income per Diluted Share
        
Total Shareholder Return Amount $ 214.50 266.28 243.36 234.42 156.74
Peer Group Total Shareholder Return Amount 158.26 151.60 148.16 132.62 100.14
Net Income (Loss) $ 1,179,000,000 $ 1,091,000,000 $ 792,000,000 $ 659,000,000 $ 673,000,000
Company Selected Measure Amount | $ / shares 22.65 20.88 17.92 13.54 10.67
PEO Name Joseph Zubretsky        
Additional 402(v) Disclosure The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described in footnote 3 below. Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards column are the amounts from the Stock Awards column set forth in the Summary Compensation Table.        
Measure:: 1          
Pay vs Performance Disclosure          
Name Adjusted Net Income per Diluted Share        
Non-GAAP Measure Description We determined Adjusted EPS to be the most important financial performance measure used to link Company performance to Compensation Actually Paid to our PEO and Non-PEO NEOs in 2024. Adjusted EPS represents adjusted net income divided by weighted average common shares outstanding on a fully diluted basis. Adjusted net income represents GAAP net income recognizing adjustments, net of tax. Adjustments represent additions and deductions to GAAP net income which include the non-cash impact of amortization of acquired intangible assets, acquisition-related expenses, and the impact of certain expenses and other items that management believes are not indicative of longer-term business trends and operations. This performance measure may not have been the most important financial performance measure for the four preceding fiscal years and we may determine a different financial performance measure to be the most important financial performance measure in future years.        
PEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 0        
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (16,200,092)        
PEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 9,654,851        
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 10,861,829        
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (3,584,702)        
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 2,377,724        
PEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (44,898)        
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (3,725,057)        
Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 2,102,071        
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 2,497,585        
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (735,220)        
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0        
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 339,706        
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 0