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Separate Account Balances - Separate Account Asset (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 167,605.6 | $ 155,375.1
Fixed maturities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 35,503.9 | 34,805.5
Fixed maturities | U.S. government and agencies |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 8,467.3 | 7,339.6
Fixed maturities | Non-U.S. governments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 8,522.3 | 8,424.3
Fixed maturities | States and political subdivisions |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 205.1 | 211.7
Fixed maturities | Corporate debt securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 13,386.4 | 14,429.7
Fixed maturities | Residential mortgage-backed pass-through securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 4,126.1 | 3,894.5
Fixed maturities | Commercial mortgage-backed securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 221.1 | 206.2
Fixed maturities | Other debt obligations |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 575.6 | 299.5
Equity securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 118,073.7 | 105,053.3
Real estate |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 494.6 | 610.6
Other investments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 9,436.2 | 10,278.6
Cash and cash equivalents |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 3,332.8 | 3,583.8
Other assets |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 764.4 | $ 1,043.3

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