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Retirement and Postretirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The components of net periodic benefit cost (income) for the three months ended June 30, 2025 were as follows:
|  | Pension |  |  |  |  |  |  |
|  | United States of America |  |  | United Kingdom |  |  |  |  |  |  |
|  | Bargaining Plan |  |  | Supplemental Plan |  |  | Pension Scheme |  |  | Total Pension |  |  | Postretirement Plans |
Service cost |  | $ | 2.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.2 |  |  | $ | 0.1 |
Interest cost |  |  | 6.5 |  |  |  | 0.2 |  |  |  | 0.7 |  |  |  | 7.4 |  |  |  | 1.1 |
Expected return on plan assets |  |  | (7.5 | ) |  |  | — |  |  |  | (0.6 | ) |  |  | (8.1 | ) |  |  | (0.7 | )
Amortization of prior service cost |  |  | 0.3 |  |  |  | — |  |  |  | — |  |  |  | 0.3 |  |  |  | (1.5 | )
Net Periodic Benefit Cost (Income) |  | $ | 1.5 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 1.8 |  |  | $ | (1.0 | )
The components of net periodic benefit cost (income) for the three months ended June 30, 2024 were as follows:
|  | Pension |  |  |  |  |  |  |
|  | United States of America |  |  | United Kingdom |  |  |  |  |  |  |
|  | Bargaining Plan |  |  | Salaried Plan |  |  | Supplemental Plan |  |  | Pension Scheme |  |  | Total Pension |  |  | Postretirement Plans |
Service cost |  | $ | 2.2 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.3 |  |  | $ | 0.1 |
Interest cost |  |  | 6.4 |  |  |  | 1.0 |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 8.2 |  |  |  | 1.1 |
Expected return on plan assets |  |  | (7.0 | ) |  |  | (1.1 | ) |  |  | — |  |  |  | (0.7 | ) |  |  | (8.8 | ) |  |  | (0.7 | )
Amortization of prior service cost |  |  | 0.3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.3 |  |  |  | (1.5 | )
Net remeasurement losses (gains) |  |  | — |  |  |  | 1.0 |  |  |  | — |  |  |  | — |  |  |  | 1.0 |  |  |  | — |
Net Periodic Benefit Cost (Income) |  | $ | 1.9 |  |  | $ | 1.0 |  |  | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 3.0 |  |  | $ | (1.0 | )
The components of net periodic benefit cost (income) for the six months ended June 30, 2025 were as follows:
|  | Pension |  |  |  |  |  |  |
|  | United States of America |  |  | United Kingdom |  |  |  |  |  |  |
|  | Bargaining Plan |  |  | Supplemental Plan |  |  | Pension Scheme |  |  | Total Pension |  |  | Postretirement Plans |
Service cost |  | $ | 4.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 4.4 |  |  | $ | 0.2 |
Interest cost |  |  | 13.0 |  |  |  | 0.4 |  |  |  | 1.4 |  |  |  | 14.8 |  |  |  | 2.2 |
Expected return on plan assets |  |  | (15.0 | ) |  |  | — |  |  |  | (1.2 | ) |  |  | (16.2 | ) |  |  | (1.4 | )
Amortization of prior service cost |  |  | 0.6 |  |  |  | — |  |  |  | — |  |  |  | 0.6 |  |  |  | (3.0 | )
Net Periodic Benefit Cost (Income) |  | $ | 3.0 |  |  | $ | 0.4 |  |  | $ | 0.2 |  |  | $ | 3.6 |  |  | $ | (2.0 | )
The components of net periodic benefit cost (income) for the six months ended June 30, 2024 were as follows:
|  | Pension |  |  |  |  |  |  |
|  | United States of America |  |  | United Kingdom |  |  |  |  |  |  |
|  | Bargaining Plan |  |  | Salaried Plan |  |  | Supplemental Plan |  |  | Pension Scheme |  |  | Total Pension |  |  | Postretirement Plans |
Service cost |  | $ | 4.4 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 4.7 |  |  | $ | 0.2 |
Interest cost |  |  | 12.8 |  |  |  | 2.5 |  |  |  | 0.4 |  |  |  | 1.2 |  |  |  | 16.9 |  |  |  | 2.2 |
Expected return on plan assets |  |  | (14.0 | ) |  |  | (2.7 | ) |  |  | — |  |  |  | (1.4 | ) |  |  | (18.1 | ) |  |  | (1.4 | )
Amortization of prior service cost |  |  | 0.6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.6 |  |  |  | (3.0 | )
Net remeasurement losses (gains) |  |  | — |  |  |  | 1.8 |  |  |  | — |  |  |  | — |  |  |  | 1.8 |  |  |  | — |
Net Periodic Benefit Cost (Income) |  | $ | 3.8 |  |  | $ | 1.9 |  |  | $ | 0.4 |  |  | $ | (0.2 | ) |  | $ | 5.9 |  |  | $ | (2.0 | )

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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://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 2: 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 3: 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 4: 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 5: 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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