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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Loss by Components (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income |  |  |
Beginning balance | $ 1,395.1 | $ 1,270.3 | $ 1,081.4
Other comprehensive loss before reclassifications | 10.3 | (52.5) | 6.3
Amounts reclassified from accumulated other comprehensive loss | 0.8 | 1.2 | 13.6
Other comprehensive income (loss), net of tax | 11.1 | (51.3) | 19.9
Less: other comprehensive income (loss) attributable to non-controlling interests | 0.0 | (3.4) | 0.4
Other comprehensive income (loss), net of tax attributable to Enpro Inc. | 11.1 | (47.9) | 19.5
Ending balance | 1,409.7 | 1,395.1 | 1,270.3
Total |  |  |
Accumulated Other Comprehensive Income |  |  |
Beginning balance | (33.3) | 14.6 | (4.9)
Other comprehensive income (loss), net of tax attributable to Enpro Inc. | 11.1 | (47.9) | 19.5
Ending balance | (22.2) | (33.3) | 14.6
Unrealized Translation Adjustments |  |  |
Accumulated Other Comprehensive Income |  |  |
Beginning balance | 11.8 | 46.7 | 31.7
Other comprehensive loss before reclassifications | 12.3 | (39.7) | 2.5
Amounts reclassified from accumulated other comprehensive loss | 0.0 | 1.4 | 12.9
Other comprehensive income (loss), net of tax | 12.3 | (38.3) | 15.4
Less: other comprehensive income (loss) attributable to non-controlling interests | 0.0 | (3.4) | 0.4
Other comprehensive income (loss), net of tax attributable to Enpro Inc. | 12.3 | (34.9) | 15.0
Ending balance | 24.1 | 11.8 | 46.7
Pension and Other Postretirement Plans |  |  |
Accumulated Other Comprehensive Income |  |  |
Beginning balance | (45.1) | (32.1) | (36.6)
Other comprehensive loss before reclassifications | (2.0) | (12.8) | 3.8
Amounts reclassified from accumulated other comprehensive loss | 0.8 | (0.2) | 0.7
Other comprehensive income (loss), net of tax | (1.2) | (13.0) | 4.5
Less: other comprehensive income (loss) attributable to non-controlling interests | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of tax attributable to Enpro Inc. | (1.2) | (13.0) | 4.5
Ending balance | $ (46.3) | $ (45.1) | $ (32.1)

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