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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | $ 652.2 |  | $ 631.2 |  | $ 692.5
Other comprehensive (loss) income, net of tax |  | 7.4 |  | 9.9 |  | 6.9
Ending balance |  | 668.0 |  | 652.2 |  | 631.2
Defined Benefit Plans: |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 11.0 |  | 2.8 |  | (21.4)
Less: income tax benefit (expense) | [1] | (0.1) |  | (1.0) |  | (1.2)
Net (gain) loss reclassified from AOCI to Net income (loss) |  | 0.4 |  | 3.2 |  | 3.7
Other comprehensive (loss) income, net of tax |  | 8.1 |  | 8.2 |  | 24.2
Ending balance |  | 19.1 |  | 11.0 |  | 2.8
Defined Benefit Plans: Net Actuarial Gain |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Unrealized loss on cash flow hedges |  | 12.2 |  | 4.3 |  | 27.0
Less: income tax benefit (expense) |  | (2.8) |  | (1.0) |  | (6.5)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | 9.4 |  | 3.3 |  | 20.5
Reclassification from AOCI | [2],[3] | (2.0) |  | (1.1) |  |
Defined Benefit Plans: Net Prior Service (Cost) Credit |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Unrealized loss on cash flow hedges |  | (2.2) |  | 2.2 |  |
Less: income tax benefit (expense) |  | 0.5 |  | (0.5) |  |
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | (1.7) |  | 1.7 |  |
Reclassification from AOCI | [3] | 2.5 |  | 5.3 |  | 4.9
Cash Flow Hedges: |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 2.1 | [4] | 0.4 | [4] | 17.7
Unrealized loss on cash flow hedges |  | (0.2) |  | (10.7) |  | (12.2)
Less: income tax benefit (expense) |  |  |  | 2.5 |  | 2.9
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges |  | (0.2) |  | (8.2) |  | (9.3)
Reclassification from AOCI |  | (0.9) |  | 12.9 |  | (10.5)
Reclassification due to forecasted transactions probable of not occurring |  | 0.2 |  |  |  |
Less: income tax benefit (expense) | [1] | 0.2 |  | (3.0) |  | 2.5
Net (gain) loss reclassified from AOCI to Net income (loss) |  | (0.5) |  | 9.9 |  | (8.0)
Other comprehensive (loss) income, net of tax |  | (0.7) |  | 1.7 |  | (17.3)
Ending balance | [4] | 1.4 |  | 2.1 |  | 0.4
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 13.1 |  | 3.2 |  | (3.7)
Other comprehensive (loss) income, net of tax |  | 7.4 |  | 9.9 |  | 6.9
Ending balance |  | $ 20.5 |  | $ 13.1 |  | $ 3.2
[1] | Income tax amounts reclassified out of AOCI were included as a component of Inc ome tax (provision) benefit.
[2] | Amounts amortized out of AOCI during the year ended December 31, 2024 include net actuarial gains recognized on a pro-rata basis in conjunction with a group annuity purchase (see Note 5).
[3] | Amounts amortized out of AOCI related to pension and other postretirement and postemployment benefits were included within Net periodic postretirement and postemployment benefit cost (see Note 5).
[4] | As of December 31, 2024, we esti mate a net mark-to-market gain before tax of $1.9 million in AOCI will be reclassified into Net income (loss) upon settlement within the next 12 months.

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