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Retirement and Postretirement Plans (Tables) | 9 Months Ended
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Sep. 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 September 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 September 30, 2024 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 |  |  | 6.4 |  |  |  | 0.2 |  |  |  | 0.6 |  |  |  | 7.2 |  |  |  | 1.1 |
Expected return on plan assets |  |  | (7.0 | ) |  |  | — |  |  |  | (0.7 | ) |  |  | (7.7 | ) |  |  | (0.7 | )
Amortization of prior service cost |  |  | 0.3 |  |  |  | — |  |  |  | — |  |  |  | 0.3 |  |  |  | (1.5 | )
Net Periodic Benefit Cost (Income) |  | $ | 1.9 |  |  | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 2.0 |  |  | $ | (1.0 | )
The components of net periodic benefit cost (income) for the nine months ended September 30, 2025 were as follows:
|  | Pension |  |  |  |  |  |  |
|  | United States of America |  |  | United Kingdom |  |  |  |  |  |  |
|  | Bargaining Plan |  |  | Supplemental Plan |  |  | Pension Scheme |  |  | Total Pension |  |  | Postretirement Plans |
Service cost |  | $ | 6.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 6.6 |  |  | $ | 0.3 |
Interest cost |  |  | 19.5 |  |  |  | 0.6 |  |  |  | 2.1 |  |  |  | 22.2 |  |  |  | 3.3 |
Expected return on plan assets |  |  | (22.5 | ) |  |  | — |  |  |  | (1.8 | ) |  |  | (24.3 | ) |  |  | (2.1 | )
Amortization of prior service cost |  |  | 0.9 |  |  |  | — |  |  |  | — |  |  |  | 0.9 |  |  |  | (4.5 | )
Net Periodic Benefit Cost (Income) |  | $ | 4.5 |  |  | $ | 0.6 |  |  | $ | 0.3 |  |  | $ | 5.4 |  |  | $ | (3.0 | )
The components of net periodic benefit cost (income) for the nine months ended September 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 |  | $ | 6.6 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 6.9 |  |  | $ | 0.3 |
Interest cost |  |  | 19.2 |  |  |  | 2.5 |  |  |  | 0.6 |  |  |  | 1.8 |  |  |  | 24.1 |  |  |  | 3.3 |
Expected return on plan assets |  |  | (21.0 | ) |  |  | (2.7 | ) |  |  | — |  |  |  | (2.1 | ) |  |  | (25.8 | ) |  |  | (2.1 | )
Amortization of prior service cost |  |  | 0.9 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.9 |  |  |  | (4.5 | )
Net remeasurement losses (gains) |  |  | — |  |  |  | 1.8 |  |  |  | — |  |  |  | — |  |  |  | 1.8 |  |  |  | — |
Net Periodic Benefit Cost (Income) |  | $ | 5.7 |  |  | $ | 1.9 |  |  | $ | 0.6 |  |  | $ | (0.3 | ) |  | $ | 7.9 |  |  | $ | (3.0 | )

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