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Investments - Net Realized Capital Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Major components of net realized capital gains (losses) on investments |  |
Fixed maturities, available-for-sale: Gross gains | $ 23.1 | $ 2.5
Fixed maturities, available-for-sale: Gross losses | (4.2) | (1.5)
Fixed maturities, available-for-sale: Net credit loss | (7.9) |
Fixed maturities, available-for-sale: Net credit loss |  | (6.8)
Fixed maturities, available-for-sale: Hedging, net | (1.5) |
Fixed maturities, trading | (16.4) | 14.2
Equity securities | (63.7) | 21.0
Net realized capital gains (losses) | 131.4 | 84.5
Unrealized gains (losses) on fixed maturities, trading | (14.2) | 14.2
Unrealized gains (losses) on equity securities | (66.0) | 19.8
Unrealized gains (losses) on equity securities reported in net investment income | (38.5) | 22.5
Proceeds from sales of investments |  |
Proceeds from sales of investments in fixed maturities, available-for-sale | 541.6 | 163.0
Mortgage loans |  |
Major components of net realized capital gains (losses) on investments |  |
Realized capital gains (losses) | (15.7) | 0.3
Derivatives |  |
Major components of net realized capital gains (losses) on investments |  |
Realized capital gains (losses) | 290.5 | 5.0
Other investment types |  |
Major components of net realized capital gains (losses) on investments |  |
Realized capital gains (losses) | $ (72.8) | $ 49.8

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