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Accumulated Other Comprehensive Income Attributable to SMP (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive by Component |
| Three Months Ended March 31, 2025
(in thousands) | Foreign Currency Translation |  | Cash Flow Hedges |  | Postretirement Benefit Plans |  | Total
Balance at December 31, 2024 | $ | (29,769) |  |  | $ | 3,924 |  |  | $ | 13 |  |  | $ | (25,832) |
Other comprehensive income (loss) before reclassifications | 10,881 |  | (d) | (1,542) |  | (a) | — |  |  | 9,339 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 412 |  | (b) | (4) |  | (c) | 408 |
Net other comprehensive income (loss) | 10,881 |  |  | (1,130) |  |  | (4) |  |  | 9,747 |
Tax amounts | 2,134 |  |  | 294 |  |  | 2 |  |  | 2,430 |
Balance at March 31, 2025 | $ | (16,754) |  |  | $ | 3,088 |  |  | $ | 11 |  |  | $ | (13,655) |
| Three Months Ended March 31, 2024
(in thousands) | Foreign Currency Translation |  | Cash Flow Hedges |  | Postretirement Benefit Plans |  | Total
Balance at December 31, 2023 | $ | (8,897) |  |  | $ | 2,899 |  |  | $ | 24 |  |  | $ | (5,974) |
Other comprehensive income (loss) before reclassifications | (1,220) |  |  | 1,209 |  | (a) | — |  |  | (11) |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 671 |  | (b) | (4) |  | (c) | 667 |
Net other comprehensive income (loss) | (1,220) |  |  | 1,880 |  |  | (4) |  |  | 656 |
Tax amounts | — |  |  | (489) |  |  | 1 |  |  | (488) |
Balance at March 31, 2024 | $ | (10,117) |  |  | $ | 4,290 |  |  | $ | 21 |  |  | $ | (5,806) |
(a)Consists of the unrecognized loss relating to the change in fair value of cash flow interest rate hedges of $1.1 million ($0.8 million, net of tax) and $1.9 million ($1.4 million, net of tax) in the three months ended March 31, 2025 and 2024, respectively and cash settlement receipts of $0.4 million ($0.3 million, net of tax) and $0.7 million ($0.5 million, net of tax) in the three months ended March 31, 2025 and 2024, respectively. (b)Unrecognized accumulated other comprehensive income (loss) related to cash flow interest rate hedges are reclassified to earnings and reported in interest expense in our consolidated statements of operations when the interest payments on the underlying borrowings are recognized. (c)Unrecognized accumulated other comprehensive income (loss) related to our postretirement benefit plans is reclassified to earnings and included in the computation of net periodic postretirement benefit costs, which are included in other non-operating income, net in our consolidated statements of operations. (d)Foreign currency translation primarily reflects the appreciation of the Danish kroner and the Polish zloty.

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