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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive Income (loss) by component (after tax) are as follows:
(in millions) | Unrealized Translation Adjustments |  | Pension and Other Postretirement Plans |  |  |  | Total
Balance at December 31, 2020 | $ | 31.7 |  |  | $ | (36.6) |  |  |  |  | $ | (4.9) |
Other comprehensive income before reclassifications | 2.5 |  |  | 3.8 |  |  |  |  | 6.3 |
Amounts reclassified from accumulated other comprehensive loss | 12.9 |  |  | 0.7 |  |  |  |  | 13.6 |
Net current-period other comprehensive income | 15.4 |  |  | 4.5 |  |  |  |  | 19.9 |
Less: other comprehensive income attributable to redeemable non-controlling interests | 0.4 |  |  | — |  |  |  |  | 0.4 |
Net current-period other comprehensive income attributable to Enpro Inc. | 15.0 |  |  | 4.5 |  |  |  |  | 19.5 |
Balance at December 31, 2021 | 46.7 |  |  | (32.1) |  |  |  |  | 14.6 |
Other comprehensive income before reclassifications | (39.7) |  |  | (12.8) |  |  |  |  | (52.5) |
Amounts reclassified from accumulated other comprehensive loss | 1.4 |  |  | (0.2) |  |  |  |  | 1.2 |
Net current-period other comprehensive income | (38.3) |  |  | (13.0) |  |  |  |  | (51.3) |
Less: other comprehensive income attributable to redeemable non-controlling interests | (3.4) |  |  | — |  |  |  |  | (3.4) |
Net current-period other comprehensive income attributable to Enpro Inc. | (34.9) |  |  | (13.0) |  |  |  |  | (47.9) |
Balance at December 31, 2022 | 11.8 |  |  | (45.1) |  |  |  |  | (33.3) |
Other comprehensive loss before reclassifications | 12.3 |  |  | (2.0) |  |  |  |  | 10.3 |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 0.8 |  |  |  |  | 0.8 |
Net current-period other comprehensive income | 12.3 |  |  | (1.2) |  |  |  |  | 11.1 |
Less: other comprehensive income attributable to redeemable non-controlling interests | — |  |  | — |  |  |  |  | — |
Net current-period other comprehensive income (loss) attributable to Enpro Inc. | 12.3 |  |  | (1.2) |  |  |  |  | 11.1 |
Balance at December 31, 2023 | $ | 24.1 |  |  | $ | (46.3) |  |  |  |  | $ | (22.2) |
Schedule of Reclassification out of Comprehensive Income (Loss) | Reclassifications out of accumulated other comprehensive income (loss) are as follows:
Details about Accumulated Other Comprehensive Loss Components |  | Amount Reclassified from Accumulated Other Comprehensive Loss | Affected Statement of Operations Caption
|  | Years Ended December 31, |
|  | 2023 |  | 2022 |  | 2021 |
|  | (in millions) |
Pension and other postretirement plans adjustments: |  |  |  |  |  |  |
Amortization of actuarial losses |  | $ | 0.8 |  |  | $ | 0.6 |  |  | $ | 0.8 |  | (1)
Amortization of prior service costs |  | (0.1) |  |  | 0.2 |  |  | 0.1 |  | (1)
Curtailments |  | 0.3 |  |  | (1.0) |  |  | — |  | (1)
Total before tax |  | 1.0 |  |  | (0.2) |  |  | 0.9 |  | Income (loss) from continuing operations before income taxes
Tax benefit |  | (0.2) |  |  | — |  |  | (0.2) |  | Income tax expense
Net of tax |  | $ | 0.8 |  |  | $ | (0.2) |  |  | $ | 0.7 |  | Income (loss) from continuing operations
Release of unrealized currency translation adjustment upon sale of investment in foreign entity, net of tax |  | $ | — |  |  | $ | 1.4 |  |  | $ | 12.9 |  | Other (non-operating) income (expense); Income from discontinued operations, including gain on sale, net of taxes
(1) These accumulated other comprehensive income (loss) components are included in the computation of net periodic pension cost. Since these are components of net periodic pension cost other than service cost, the affected Consolidated Statement of Operations caption is other (non-operating) expense. (See Note 14, "Pension" for additional details).

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