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Separate Account Balances - Separate Account Asset (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Separate Account Assets
Total separate account assets per consolidated statements of financial position	$ 189,251.5	$ 173,327.1
Fixed maturities
Separate Account Assets
Total separate account assets per consolidated statements of financial position	35,742.7	33,301.1
Fixed maturities | U.S. government and agencies
Separate Account Assets
Total separate account assets per consolidated statements of financial position	8,860.0	7,537.1
Fixed maturities | Non-U.S. governments
Separate Account Assets
Total separate account assets per consolidated statements of financial position	8,890.8	8,461.5
Fixed maturities | States and political subdivisions
Separate Account Assets
Total separate account assets per consolidated statements of financial position	165.4	170.1
Fixed maturities | Corporate debt securities
Separate Account Assets
Total separate account assets per consolidated statements of financial position	12,827.4	12,590.9
Fixed maturities | Residential mortgage-backed pass-through securities
Separate Account Assets
Total separate account assets per consolidated statements of financial position	4,244.6	3,746.0
Fixed maturities | Commercial mortgage-backed securities
Separate Account Assets
Total separate account assets per consolidated statements of financial position	305.0	201.4
Fixed maturities | Other debt obligations
Separate Account Assets
Total separate account assets per consolidated statements of financial position	449.5	594.1
Equity securities
Separate Account Assets
Total separate account assets per consolidated statements of financial position	138,191.3	126,575.0
Real estate
Separate Account Assets
Total separate account assets per consolidated statements of financial position	444.9	441.3
Other investments
Separate Account Assets
Total separate account assets per consolidated statements of financial position	8,886.4	8,160.2
Cash and cash equivalents
Separate Account Assets
Total separate account assets per consolidated statements of financial position	4,812.1	4,021.7
Other assets
Separate Account Assets
Total separate account assets per consolidated statements of financial position	$ 1,174.1	$ 827.8

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