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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 664.9 |  | $ 652.2 | $ 635.6 |  | $ 631.2 | $ 652.2 |  | $ 631.2 |
Other comprehensive income (loss), net of tax |  | 3.2 |  | (2.1) | (7.3) |  | (1.1) | 1.1 |  | (8.4) |
Ending balance |  | 662.0 |  | 664.9 | 638.1 |  | 635.6 | 662.0 |  | 638.1 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 10.5 |  | 11.0 | 3.5 |  | 2.8 | 11.0 |  | 2.8 |
Less: income tax benefit (expense) | [1] | (0.1) |  |  | (0.2) |  |  |  |  | (0.4) |
Net (gain) loss reclassified from AOCI to Net income |  | 0.5 |  |  | 0.9 |  |  |  |  | 1.6 |
Other comprehensive income (loss), net of tax |  | (0.1) |  |  | (4.6) |  |  | (0.6) |  | (3.9) |
Ending balance |  | 10.4 |  | 10.5 | (1.1) |  | 3.5 | 10.4 |  | (1.1) |
Defined Benefit Plans: Net Actuarial Gain |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on securities |  | 1.4 |  |  | (0.6) |  |  | 1.4 |  | (0.6) |
Less: income tax (expense) benefit |  | (0.3) |  |  | 0.1 |  |  | (0.3) |  | 0.1 |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | 1.1 |  |  | (0.5) |  |  | 1.1 |  | (0.5) |
Reclassification from AOCI | [2] | (0.2) |  |  | (0.3) |  |  | (0.5) |  | (0.6) |
Defined Benefit Plans: Net Prior Service (Credit) Cost |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on securities |  | (2.2) |  |  | (6.6) |  |  | (2.2) |  | (6.6) |
Less: income tax (expense) benefit |  | 0.5 |  |  | 1.6 |  |  | 0.5 |  | 1.6 |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | (1.7) |  |  | (5.0) |  |  | (1.7) |  | (5.0) |
Reclassification from AOCI | [2] | 0.8 |  |  | 1.4 |  |  | 0.5 |  | 2.6 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 0.5 |  | 2.1 | (1.4) |  | 0.4 | 2.1 |  | 0.4 |
Unrealized gain (loss) on securities |  | 6.1 |  |  | (9.0) |  |  | 1.9 |  | (11.6) |
Less: income tax (expense) benefit |  | (1.4) |  |  | 2.1 |  |  | (0.4) |  | 2.7 |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | 4.7 |  |  | (6.9) |  |  | 1.5 |  | (8.9) |
Reclassification from AOCI |  | (2.0) |  |  | 5.5 |  |  | 0.1 |  | 5.7 |
Reclassification due to forecasted transactions probable of not occurring |  | 0.2 |  |  |  |  |  | 0.2 |  |  |
Less: income tax benefit (expense) |  | 0.4 |  |  | (1.3) |  |  | (0.1) |  | (1.3) |
Net (gain) loss reclassified from AOCI to Net income |  | (1.4) |  |  | 4.2 |  |  | 0.2 |  | 4.4 |
Other comprehensive income (loss), net of tax |  | 3.3 |  |  | (2.7) |  |  | 1.7 |  | (4.5) |
Ending balance |  | 3.8 | [3] | 0.5 | (4.1) | [3] | (1.4) | 3.8 | [3] | (4.1) | [3]
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 11.0 |  | 13.1 | 2.1 |  | 3.2 | 13.1 |  | 3.2 |
Other comprehensive income (loss), net of tax |  | 3.2 |  | (2.1) | (7.3) |  | (1.1) |  |  |  |
Ending balance |  | $ 14.2 |  | $ 11.0 | $ (5.2) |  | $ 2.1 | $ 14.2 |  | $ (5.2) |
[1] | Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
[2] | Amounts amortized out of AOCI related to pension and other postretirement benefits were included within Net periodic postretirement benefit cost (see Note 3).
[3] | As of June 30, 2024, we estimate a net mark-to-market gain before tax of $3.9 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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