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Income Tax Matters - Income Tax (Provision) Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Federal income tax (expense) benefit |  |  |
Deferred federal income tax (expense) benefit | $ (11.6) | $ 8.9 | $ 2.1
Federal benefit (expense) applied to decrease (increase) AOCI | 2.5 | 1.7 | 3.7
Federal income tax (provision) benefit | (9.1) | 10.6 | 5.8
Foreign income tax (expense) benefit |  |  |
Current foreign tax (expense) benefit | (2.2) | (1.1) | (2.4)
Deferred foreign income tax (expense) benefit | 0.1 | (0.8) | 0.5
Foreign benefit (expense) applied to decrease (increase) AOCI | 0.1 | 0.2 | 0.3
Foreign income tax (provision) benefit | (2.0) | (1.7) | (1.6)
State income tax (expense) benefit |  |  |
Current state tax (expense) benefit | 0.6 | (2.5) | (3.5)
Deferred state income tax (expense) benefit | 1.0 | 1.6 | 4.2
State benefit (expense) applied to decrease (increase) AOCI | 0.4 | 0.3 | 0.6
State income tax (provision) benefit | 2.0 | (0.6) | 1.3
Total income tax (expense) benefit |  |  |
Current tax (expense) benefit | (1.6) | (3.6) | (5.9)
Deferred income tax (expense) benefit | (10.5) | 9.7 | 6.8
Benefit (expense) applied to decrease (increase) AOCI | 3.0 | 2.2 | 4.6
Income tax (provision) benefit | $ (9.1) | $ 8.3 | $ 5.5

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