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Fair value measurement (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Pension Plan Assets by Level Within Fair Value Hierarchy | The following table sets forth by level, within the fair value hierarchy, the fair values of assets and liabilities related to the following pension plans: the (i) GR Plan, (ii) Union Plan, (iii) U.K. Pension Plan, (iv) Detroit Plan (v) GWP Plan, and (vi) TPC Plan as of December 31, 2025:
In thousands | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $8,201 |  | $1,931 |  | $— |  | $10,132
Corporate common stock | 66,017 |  | — |  | — |  | 66,017
Corporate and government bonds | — |  | 166,200 |  | — |  | 166,200
Real estate | — |  | — |  | 106,365 |  | 106,365
Mutual funds | 48,698 |  | — |  | — |  | 48,698
Interest in common/collective trusts: |  |  |  |  |  |  |
Equities | — |  | 76,553 |  | — |  | 76,553
Fixed income | — |  | 831,730 |  | — |  | 831,730
Partnership/joint venture interests | — |  | — |  | 162,742 |  | 162,742
Total plan assets at fair value excluding those measured at NAV | $122,916 |  | $1,076,414 |  | $269,107 |  | $1,468,437
Instruments measured at NAV using the practical expedient:
Real estate funds |  |  |  |  |  |  | 9,011
Interest in common/collective trusts - fixed income |  |  |  |  |  |  | 16,961
Partnerships/joint ventures |  |  |  |  |  |  | 804
Total plan assets at fair value |  |  |  |  |  |  | $1,495,213
Liabilities: |  |  |  |  |  |  |
Other liabilities | $(1,525) |  | $— |  | $— |  | $(1,525)
Total plan liabilities at fair value | $(1,525) |  | $— |  | $— |  | $(1,525)
The following table sets forth by level, within the fair value hierarchy, the fair values of assets and liabilities related to the following pension plans: the (i) GR Plan, (ii) Union Plan, (iii) U.K. Pension Plan, (iv) Detroit Plan (v) GWP Plan, and (vi) TPC Plan as of December 31, 2024:
In thousands | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $10,989 |  | $1,695 |  | $— |  | $12,684
Corporate common stock | 66,725 |  | — |  | — |  | 66,725
Corporate and government bonds | — |  | 231,518 |  | — |  | 231,518
Real estate | — |  | — |  | 124,790 |  | 124,790
Mutual funds | 20,430 |  | — |  | — |  | 20,430
Exchange traded funds | 23,215 |  | — |  | — |  | 23,215
Interest in common/collective trusts: |  |  |  |  |  |  |
Equities | — |  | 255,382 |  | — |  | 255,382
Fixed income | — |  | 721,506 |  | — |  | 721,506
Partnership/joint venture interests | — |  | — |  | 171,476 |  | 171,476
Total plan assets at fair value, excluding those measured at NAV | $121,359 |  | $1,210,101 |  | $296,266 |  | $1,627,726
Assets measured at NAV using the practical expedient: |  |  |  |  |  |  |
Real estate funds |  |  |  |  |  |  | 8,814
Interest in common/collective trusts - fixed income |  |  |  |  |  |  | 23,163
Partnership/joint venture interests |  |  |  |  |  |  | 1,675
Total plan assets at fair value |  |  |  |  |  |  | $1,661,378
Liabilities: |  |  |  |  |  |  |
Other liabilities | $(1,676) |  | $— |  | $— |  | $(1,676)
Total plan liabilities at fair value | $(1,676) |  | $— |  | $— |  | $(1,676)
Schedule of Changes in Fair Value of Pension Plan Assets and Liabilities, Categorized as Level 3 | The following table sets forth a summary of changes in the fair value of the Level 3 pension plan assets for the year ended December 31, 2025:
|  |  | Actual return on plan assets |  |  |  |  |  |  |  |
In thousands | Balance at beginning of year |  | Relating to assets still held at report date |  | Relating to assets sold/ redeemed during the period |  | Purchases |  | Sales |  | Settlements |  | Balance at end of year
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate | $124,790 |  | $10,468 |  | $— |  | $— |  | $(28,893) |  | $— |  | $106,365
Partnership/joint venture interests | 171,476 |  | 5,841 |  | — |  | 27,480 |  | (32,879) |  | (9,176) |  | 162,742
Total assets | $296,266 |  | $16,309 |  | $— |  | $27,480 |  | $(61,772) |  | $(9,176) |  | $269,107
The following table sets forth a summary of changes in the fair value of the Level 3 pension plan assets and liabilities for the year ended December 31, 2024:
|  |  | Actual return on plan assets |  |  |  |  |  |  |  |
In thousands | Balance at beginning of year |  | Relating to assets still held at report date |  | Relating to assets sold during the period |  | Purchases |  | Sales |  | Settlements |  | Balance at end of year
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate | $133,503 |  | $(2,039) |  | $— |  | $— |  | $(6,674) |  | $— |  | $124,790
Partnership/joint venture interests | 169,932 |  | (10,044) |  | — |  | 39,243 |  | (23,899) |  | (3,756) |  | 171,476
Hedge funds | 48,695 |  | — |  | 7 |  | — |  | — |  | (48,702) |  | —
Total assets | $352,130 |  | $(12,083) |  | $7 |  | $39,243 |  | $(30,573) |  | $(52,458) |  | $296,266

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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