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Accumulated Other Comprehensive Loss ("AOCL") (Tables) | 3 Months Ended
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Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated balances for each component of AOCI |
Components of AOCL: |  | March 31, 2024 |  | December 31, 2023
Defined benefit plan liabilities |  | $ | (103.5) |  |  | $ | (101.8) |
Unrealized gain on financial instruments |  | 1.6 |  |  | 1.6 |
Other comprehensive loss before income tax effect |  | (101.9) |  |  | (100.2) |
Income tax effect(1) |  | 2.3 |  |  | 2.3 |
Accumulated other comprehensive loss |  | $ | (99.6) |  |  | $ | (97.9) |
(1)The allocation of the income tax effect to the components of other comprehensive loss is as follows:
|  | March 31, 2024 |  | December 31, 2023
Defined benefit plan liabilities |  | $ | 2.6 |  |  | $ | 2.6 |
Unrealized gain on financial instruments |  | (0.3) |  |  | (0.3) |
The following table summarizes the changes in the accumulated balances for each component of AOCL:
| Defined benefit plan and other postretirement liabilities |  | Unrealized gain on financial instruments |  | Total, net of tax
Balance, December 31, 2023 | $ | (99.4) |  |  | $ | 1.5 |  |  | $ | (97.9) |
Other comprehensive loss before reclassifications | (3.4) |  |  | — |  |  | (3.4) |
Net amount reclassified to net income (loss) | 1.8 |  |  | (0.1) |  |  | 1.7 |
Balance, March 31, 2024 | $ | (101.0) |  |  | $ | 1.4 |  |  | $ | (99.6) |
Balance, December 31, 2022 | $ | (95.6) |  |  | $ | 1.6 |  |  | $ | (94.0) |
Net amount reclassified to net income (loss) | 1.2 |  |  | (0.1) |  |  | 1.1 |
Balance, March 31, 2023 | $ | (94.4) |  |  | $ | 1.5 |  |  | $ | (92.9) |
Reclassification out of AOCI | Reclassifications out of AOCL were included in the consolidated statements of operations as follows:
|  |  |  | Three months ended March 31, |  |
AOCL Components |  | Location |  | 2024 |  | 2023 |  |  |  |
Defined benefit plan and other postretirement liabilities |  | Cost of goods sold |  | $ | 0.9 |  |  | $ | 0.8 |  |  |  |  |
|  | Selling, general and administrative expenses |  | 0.2 |  |  | 0.2 |  |  |  |  |
|  | Other operating expense - net |  | 0.7 |  |  | 0.2 |  |  |  |  |
|  | Net of tax |  | $ | 1.8 |  |  | $ | 1.2 |  |  |  |  |
Unrealized gain (loss) on financial instruments |  | Cost of goods sold |  | $ | (0.1) |  |  | $ | (0.1) |  |  |  |  |
|  | Net of tax |  | $ | (0.1) |  |  | $ | (0.1) |  |  |  |  |

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