| Document And Entity Information | Feb. 21, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Feb. 21, 2024 |
| Entity Registrant Name | Ryerson Holding Corporation |
| Entity Central Index Key | 0001481582 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-34735 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 26-1251524 |
| Entity Address, Address Line One | 227 W. Monroe St. |
| Entity Address, Address Line Two | 27th Floor |
| Entity Address, City or Town | Chicago |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60606 |
| City Area Code | (312) |
| Local Phone Number | 292-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value, 100,000,000 shares authorized |
| Trading Symbol | RYI |
| Security Exchange Name | NYSE |
| Amendment Description | Ryerson Holding Corporation (the “Company”) is filing this Current Report on Form 8-K/A solely to include Schedule 2 – Reconciliations of Net Income (Loss) Attributable to Ryerson Holding Corporation to EBITDA and Gross profit to Gross profit excluding LIFO (“Schedule 2”) in the press release announcing the Company's financial results for the fourth quarter and full year ended December 31, 2023, which was inadvertently omitted in the press release issued on February 21, 2024 (the “Original Press Release”). |
