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Segment Information - Income Tax Expense (Benefit) by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Information: Income tax expense (benefit) |  |  |
Income taxes (benefits) | $ 68.7 | $ 1,189.5 | $ 283.9
Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Total segment income taxes from operating earnings | 407.1 | 343.9 | 366.7
Reconciling Items |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Tax benefit related to net realized capital losses, as adjusted | (22.0) | (56.6) | (35.7)
Tax expense (benefit) related to other after-tax adjustments | (238.1) | 956.4 |
Certain adjustments related to equity method investments and noncontrolling interest | (78.3) | (54.2) | (47.1)
Retirement and Income Solutions | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Total segment income taxes from operating earnings | 130.9 | 90.6 | 94.7
Principal Asset Management | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Total segment income taxes from operating earnings | 220.7 | 213.3 | 272.2
Benefits and Protection | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Total segment income taxes from operating earnings | 97.7 | 109.1 | 70.5
Corporate | Operating Segments |  |  |
Segment Information: Income tax expense (benefit) |  |  |
Total segment income taxes from operating earnings | $ (42.2) | $ (69.1) | $ (70.7)

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