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Separate Account Balances - Separate Account Asset (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 162,000.8 | $ 155,375.1
Fixed maturities | Fixed maturities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 37,192.0 | 34,805.5
Fixed maturities | U.S. government and agencies |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 7,916.9 | 7,339.6
Fixed maturities | Non-U.S. governments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 8,956.1 | 8,424.3
Fixed maturities | States and political subdivisions |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 225.9 | 211.7
Fixed maturities | Corporate debt securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 15,538.1 | 14,429.7
Fixed maturities | Residential mortgage-backed pass-through securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 3,994.7 | 3,894.5
Fixed maturities | Commercial mortgage-backed securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 199.5 | 206.2
Fixed maturities | Other debt obligations |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 360.8 | 299.5
Equity securities |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 109,562.8 | 105,053.3
Real estate |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 604.0 | 610.6
Other investments |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 9,887.0 | 10,278.6
Cash and cash equivalents |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | 3,639.9 | 3,583.8
Other assets |  |
Separate Account Assets |  |
Total separate account assets per consolidated statements of financial position | $ 1,115.1 | $ 1,043.3

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