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Acquisitions - Narrative (Details) $ / shares in Units, $ in Billions | Mar. 26, 2019 USD ($) $ / shares | Jul. 01, 2018 USD ($)
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WellCare Health Plans, Inc. |  |
Business Acquisition [Line Items] |  |
Common stock cancelled and converted into right to Centene common stock | 3.38 |
Cash paid per acquiree share, without interest (in usd per share) | $ / shares | $ 120 |
Transaction value | $ 17.3 |
Fidelis Care |  |
Business Acquisition [Line Items] |  |
Consideration transferred |  | $ 3.6

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