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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 635.6 |  | $ 631.2 | $ 708.2 |  | $ 692.5 | $ 631.2 |  | $ 692.5 |
Other comprehensive loss, net of tax |  | (7.3) |  | (1.1) | (35.6) |  | 18.0 | (8.4) |  | (17.6) |
Ending balance |  | 638.1 |  | 635.6 | 650.0 |  | 708.2 | 638.1 |  | 650.0 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 3.5 |  | 2.8 | (20.5) |  | (21.4) | 2.8 |  | (21.4) |
Less: income tax (expense) benefit | [1] | (0.2) |  |  | (0.4) |  |  | (0.4) |  | (0.7) |
Net loss (gain) reclassified from AOCI to Net income (loss) |  | 0.9 |  |  | 0.9 |  |  | 1.6 |  | 1.8 |
Other comprehensive loss, net of tax |  | (4.6) |  |  | 0.9 |  |  | (3.9) |  | 1.8 |
Ending balance |  | (1.1) |  | 3.5 | (19.6) |  | (20.5) | (1.1) |  | (19.6) |
Defined Benefit Plans: Net Actuarial Loss |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on cash flow hedges |  | (0.6) |  |  |  |  |  | (0.6) |  |  |
Less: income tax benefit |  | 0.1 |  |  |  |  |  | 0.1 |  |  |
Net unrealized (loss) gain on cash flow hedges |  | (0.5) |  |  |  |  |  | (0.5) |  |  |
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges | [2] | (0.3) |  |  |  |  |  | (0.6) |  |  |
Defined Benefit Plans: Net Prior Service Cost |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on cash flow hedges |  | (6.6) |  |  |  |  |  | (6.6) |  |  |
Less: income tax benefit |  | 1.6 |  |  |  |  |  | 1.6 |  |  |
Net unrealized (loss) gain on cash flow hedges |  | (5.0) |  |  |  |  |  | (5.0) |  |  |
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges | [2] | 1.4 |  |  | 1.3 |  |  | 2.6 |  | 2.5 |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (1.4) |  | 0.4 | 34.8 |  | 17.7 | 0.4 |  | 17.7 |
Unrealized (loss) gain on cash flow hedges |  | (9.0) |  |  | (50.7) |  |  | (11.6) |  | (8.4) |
Less: income tax benefit |  | 2.1 |  |  | 12.0 |  |  | 2.7 |  | 2.0 |
Net unrealized (loss) gain on cash flow hedges |  | (6.9) |  |  | (38.7) |  |  | (8.9) |  | (6.4) |
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  | 5.5 |  |  | 2.9 |  |  | 5.7 |  | (17.0) |
Less: income tax (expense) benefit | [1] | (1.3) |  |  | (0.7) |  |  | (1.3) |  | 4.0 |
Net loss (gain) reclassified from AOCI to Net income (loss) |  | 4.2 |  |  | 2.2 |  |  | 4.4 |  | (13.0) |
Other comprehensive loss, net of tax |  | (2.7) |  |  | (36.5) |  |  | (4.5) |  | (19.4) |
Ending balance |  | (4.1) | [3] | (1.4) | (1.7) | [3] | 34.8 | (4.1) | [3] | (1.7) | [3]
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 2.1 |  | 3.2 | 14.3 |  | (3.7) | 3.2 |  | (3.7) |
Other comprehensive loss, net of tax |  | (7.3) |  | (1.1) | (35.6) |  | 18.0 |  |  |  |
Ending balance |  | $ (5.2) |  | $ 2.1 | $ (21.3) |  | $ 14.3 | $ (5.2) |  | $ (21.3) |
[1] | Income tax amounts reclassified out of AOCI were included as a component of Income tax (provision) benefit.
[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, 2023, we estimate a net mark-to-market loss before tax of $6.0 million in AOCI will be reclassified into Net income (loss) upon settlement within the next 12 months.

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