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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost (Credit) | The following tables summarize the components of net periodic benefit cost (credit) for the Ryerson pension plans and postretirement benefit plans other than pension:
|  | Three Months Ended June 30, |
|  | Pension Benefits |  |  | Other Benefits |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (In millions) |
Components of net periodic benefit cost (credit) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 0.1 |  |  | $ | — |
Interest cost |  |  | 3.6 |  |  |  | 3.8 |  |  |  | 0.4 |  |  |  | 0.4 |
Expected return on assets |  |  | (3.8 | ) |  |  | (3.8 | ) |  |  | — |  |  |  | — |
Settlement gain |  |  | (0.3 | ) |  |  | (0.6 | ) |  |  | — |  |  |  | — |
Recognized actuarial (gain) loss |  |  | 1.1 |  |  |  | 1.0 |  |  |  | (1.7 | ) |  |  | (1.8 | )
Net periodic benefit cost (credit) |  | $ | 1.0 |  |  | $ | 0.8 |  |  | $ | (1.2 | ) |  | $ | (1.4 | )
|  | Six Months Ended June 30, |
|  | Pension Benefits |  |  | Other Benefits |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (In millions) |
Components of net periodic benefit cost (credit) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 0.7 |  |  | $ | 0.8 |  |  |  | 0.1 |  |  | $ | 0.1 |
Interest cost |  |  | 7.3 |  |  |  | 7.5 |  |  |  | 0.8 |  |  |  | 0.8 |
Expected return on assets |  |  | (7.6 | ) |  |  | (7.6 | ) |  |  | — |  |  |  | — |
Settlement (gain) expense |  |  | (0.5 | ) |  |  | 1.1 |  |  |  | — |  |  |  | — |
Curtailment gain |  |  | — |  |  |  | (0.2 | ) |  |  | — |  |  |  | (0.1 | )
Recognized actuarial (gain) loss |  |  | 2.2 |  |  |  | 2.0 |  |  |  | (3.4 | ) |  |  | (3.6 | )
Net periodic benefit cost (credit) |  | $ | 2.1 |  |  | $ | 3.6 |  |  | $ | (2.5 | ) |  | $ | (2.8 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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