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Separate Account Balances - Separate Account Asset (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 180,728.0 | $ 173,327.1
Fixed maturities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 35,623.0 | 33,301.1
Fixed maturities | U.S. government and agencies |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 8,746.8 | 7,537.1
Fixed maturities | Non-U.S. governments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 9,292.8 | 8,461.5
Fixed maturities | States and political subdivisions |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 168.1 | 170.1
Fixed maturities | Corporate debt securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 12,680.8 | 12,590.9
Fixed maturities | Residential mortgage-backed pass-through securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 3,975.1 | 3,746.0
Fixed maturities | Commercial mortgage-backed securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 194.5 | 201.4
Fixed maturities | Other debt obligations |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 564.9 | 594.1
Equity securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 131,057.0 | 126,575.0
Real estate |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 441.2 | 441.3
Other investments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 8,739.0 | 8,160.2
Cash and cash equivalents |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 3,775.3 | 4,021.7
Other assets |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 1,092.5 | $ 827.8

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