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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | $ 652.2 | $ 631.2
Other comprehensive loss, net of tax |  | (2.1) | (1.1)
Ending balance |  | 664.9 | 635.6
Defined Benefit Plans: |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | 11.0 | 2.8
Less: income tax benefit (expense) | [1] | 0.1 | (0.2)
Other comprehensive loss, net of tax |  | (0.5) | 0.7
Ending balance |  | 10.5 | 3.5
Defined Benefit Plans: Net Actuarial Gain |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Reclassification of unrealized loss upon settlement of cash flow hedges | [2] | (0.3) | (0.3)
Defined Benefit Plans: Net Prior Service (Credit) Cost |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Reclassification of unrealized loss upon settlement of cash flow hedges | [2] | (0.3) | 1.2
Cash Flow Hedges: |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | 2.1 | 0.4
Unrealized loss on cash flow hedges |  | (4.2) | (2.6)
Less: income tax benefit |  | 1.0 | 0.6
Net unrealized loss on cash flow hedges |  | (3.2) | (2.0)
Reclassification of unrealized loss upon settlement of cash flow hedges |  | 2.1 | 0.2
Less: income tax benefit (expense) |  | (0.5) |
Net loss reclassified from AOCI to Net income |  | 1.6 | 0.2
Other comprehensive loss, net of tax |  | (1.6) | (1.8)
Ending balance | [3] | 0.5 | (1.4)
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | 13.1 | 3.2
Other comprehensive loss, net of tax |  | (2.1) | (1.1)
Ending balance |  | $ 11.0 | $ 2.1
[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 March 31, 2024, we estimate a net mark-to-market gain before tax of $0.5 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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