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Separate Account Balances - Separate Account Asset (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 171,399.8 | $ 167,605.6
Fixed maturities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 33,436.8 | 35,503.9
Fixed maturities | U.S. government and agencies |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 7,949.6 | 8,467.3
Fixed maturities | Non-U.S. governments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 7,911.2 | 8,522.3
Fixed maturities | States and political subdivisions |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 185.5 | 205.1
Fixed maturities | Corporate debt securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 12,759.1 | 13,386.4
Fixed maturities | Residential mortgage-backed pass-through securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 3,716.9 | 4,126.1
Fixed maturities | Commercial mortgage-backed securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 235.0 | 221.1
Fixed maturities | Other debt obligations |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 679.5 | 575.6
Equity securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 123,293.4 | 118,073.7
Real estate |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 439.0 | 494.6
Other investments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 8,987.6 | 9,436.2
Cash and cash equivalents |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 4,086.2 | 3,332.8
Other assets |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 1,156.8 | $ 764.4

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