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Business, Basis of Presentation and Significant Accounting Policies - Narrative (Details) $ in Millions		6 Months Ended
	Jan. 24, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Number of operating segments \| segment		3
Payments for business acquisitions, net of cash acquired		$ 0.0	$ 534.0
Goodwill acquired		748.0		$ 748.0	$ 327.0
Benefitfocus
Total purchase consideration	$ 595.0
Cash purchase consideration	583.0
Payments for business acquisitions, net of cash acquired	558.0
Cash acquired from acquisition	25.0
Cash acquired	49.0
Goodwill acquired	319.0
Intangible assets acquired	275.0
Deferred tax assets acquired	45.0
Lease liabilities assumed	91.0
Customer Relationships \| Benefitfocus
Finite-lived intangible assets acquired	$ 190.0
Acquired finite-lived intangible assets, useful life	15 years
Software \| Benefitfocus
Finite-lived intangible assets acquired	$ 70.0
Acquired finite-lived intangible assets, useful life	5 years
VFI SLK
Cash purchase consideration		53.0
Voya India
Goodwill acquired		$ 102.0
Voya India
Noncontrolling interest, ownership percentage by parent		49.00%
SLK
Noncontrolling interest, ownership percentage by noncontrolling owners		51.00%