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Commitments (Details) $ in Millions	12 Months Ended			84 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($) newEmployee	Dec. 31, 2022 USD ($)	Jan. 04, 2022 USD ($)
Department Of Health, State Of New York
Other Commitments [Line Items]
Commitment to undertaking		$ 340.0
Commitment to undertaking, term		5 years
Long term investment, California Organized Investment Network
Other Commitments [Line Items]
Commitment to undertaking			$ 30.0
Commitment to undertaking, term			5 years
Long term investment, service center in California
Other Commitments [Line Items]
Commitment to undertaking			$ 200.0
Commitment to undertaking, term			10 years
Commitment to undertaking, expensed				$ 109.0
Long term investment, service center in California | Minimum
Other Commitments [Line Items]
Commitment to undertaking, by employing (people) (at least) | newEmployee			300
Long term investment,improvement in enrollee health, locally based consumer assistance, and health care delivery system
Other Commitments [Line Items]
Commitment to undertaking			$ 65.0
Commitment to undertaking, expensed				49.0
Commitment to be paid over 2023 and 2024	$ 16.0			$ 16.0
Long term investment, investment portfolio in vehicles supporting California’s health care infrastructure
Other Commitments [Line Items]
Commitment to undertaking			$ 75.0
Magellan Health | Purchaser Business Group on Health
Other Commitments [Line Items]
Commitment to undertaking					$ 10.0
Commitment to undertaking, term	5 years
Commitments paid	$ 1.5
Commitment to undertaking, expensed	$ 10.0

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Other Commitment, Employees

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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