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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Major categories of net investment income |  |  |
Gross investment income (loss) | $ 4,330.0 | $ 3,978.3 | $ 4,544.7
Investment expenses | (238.1) | (139.8) | (115.1)
Net investment income (loss) | 4,091.9 | 3,838.5 | 4,429.6
Fixed maturities | Available-for-sale |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 2,508.9 | 2,100.3 | 2,766.3
Fixed maturities | Trading |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 43.3 | 36.8 | 19.3
Equity securities |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 66.3 | 8.9 | 57.7
Mortgage loans |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 761.7 | 771.7 | 790.2
Real estate |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 177.2 | 277.7 | 194.4
Policy loans |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 41.3 | 36.5 | 38.8
Cash and cash equivalents |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 196.6 | 57.4 | 4.3
Derivatives |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | 38.6 | 171.3 | 28.2
Other investment types |  |  |
Major categories of net investment income |  |  |
Gross investment income (loss) | $ 496.1 | $ 517.7 | $ 645.5

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- Definition Income derived from investments and on cash and cash equivalents, net of amortization of purchase discounts and premiums related to investments in debt securities. Interest income represents earnings which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. Dividend income represents a distribution of earnings to shareholders by investee companies. The purchase discount or premium is amortized to income or expense, respectively, over the life (holding period) of the securities to arrive at an amount of periodic interest income or expense which results in a constant effective yield on the investments. + References No definition available. + Details
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