| Form N-CSR Cover | 6 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE FLOATING RATE FUND, INC. |
| Entity Central Index Key | 0001520245 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Nov. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE FLOATING RATE FUND, INC. |
| Entity Central Index Key | 0001520245 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| C000103068 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Fund |
| Class Name | Investor Class |
| Trading Symbol | PRFRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Floating Rate Fund (the "fund") for the period of June 1, 2024 to November 30, 2024. You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Material Fund Change Notice [Text Block] | |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B20"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> |
| Additional Information Website | www.troweprice.com/prospectus |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Floating Rate Fund - Investor Class $39 0.77% |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.77% |
| AssetsNet | $ 3,771,261,000 |
| Holdings Count | Holding | 325 |
| InvestmentCompanyPortfolioTurnover | 61.30% |
| Additional Fund Statistics Significance or Limits [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,771,261 Number of Portfolio Holdings 325 |
| Holdings [Text Block] | BBB/BB Rated and Above 1.5 % BB Rated 13.6 BB/B Rated 6.4 B Rated 57.0 B/CCC Rated 2.4 CCC Rated and Below 10.6 Not Rated 3.3 Short-Term Holdings 5.2 |
| Largest Holdings [Text Block] | HUB International 2.3 % AssuredPartners 2.3 Cloud Software Group 2.2 Applied Systems 2.2 UKG 1.9 Asurion 1.8 Ellucian Holdings 1.7 Medline Borrower 1.6 Epicor Software 1.6 LifePoint Health 1.6 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| C000103069 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Fund |
| Class Name | Advisor Class |
| Trading Symbol | PAFRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Floating Rate Fund (the "fund") for the period of June 1, 2024 to November 30, 2024. You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Material Fund Change Notice [Text Block] | |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B43"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> |
| Additional Information Website | www.troweprice.com/prospectus |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Floating Rate Fund - Advisor Class $50 0.97% |
| Expenses Paid, Amount | $ 50 |
| Expense Ratio, Percent | 0.97% |
| AssetsNet | $ 3,771,261,000 |
| Holdings Count | Holding | 325 |
| InvestmentCompanyPortfolioTurnover | 61.30% |
| Additional Fund Statistics Significance or Limits [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,771,261 Number of Portfolio Holdings 325 |
| Holdings [Text Block] | BBB/BB Rated and Above 1.5 % BB Rated 13.6 BB/B Rated 6.4 B Rated 57.0 B/CCC Rated 2.4 CCC Rated and Below 10.6 Not Rated 3.3 Short-Term Holdings 5.2 |
| Largest Holdings [Text Block] | HUB International 2.3 % AssuredPartners 2.3 Cloud Software Group 2.2 Applied Systems 2.2 UKG 1.9 Asurion 1.8 Ellucian Holdings 1.7 Medline Borrower 1.6 Epicor Software 1.6 LifePoint Health 1.6 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| C000177200 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Fund |
| Class Name | I Class |
| Trading Symbol | TFAIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Floating Rate Fund (the "fund") for the period of June 1, 2024 to November 30, 2024. You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Material Fund Change Notice [Text Block] | |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B66"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> |
| Additional Information Website | www.troweprice.com/prospectus |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Floating Rate Fund - I Class $33 0.64% |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.64% |
| AssetsNet | $ 3,771,261,000 |
| Holdings Count | Holding | 325 |
| InvestmentCompanyPortfolioTurnover | 61.30% |
| Additional Fund Statistics Significance or Limits [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,771,261 Number of Portfolio Holdings 325 |
| Holdings [Text Block] | BBB/BB Rated and Above 1.5 % BB Rated 13.6 BB/B Rated 6.4 B Rated 57.0 B/CCC Rated 2.4 CCC Rated and Below 10.6 Not Rated 3.3 Short-Term Holdings 5.2 |
| Largest Holdings [Text Block] | HUB International 2.3 % AssuredPartners 2.3 Cloud Software Group 2.2 Applied Systems 2.2 UKG 1.9 Asurion 1.8 Ellucian Holdings 1.7 Medline Borrower 1.6 Epicor Software 1.6 LifePoint Health 1.6 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| C000219333 | |
| Shareholder Report [Line Items] | |
| Fund Name | Floating Rate Fund |
| Class Name | Z Class |
| Trading Symbol | TRIZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Floating Rate Fund (the "fund") for the period of June 1, 2024 to November 30, 2024. You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find the fund’s prospectus, financial information on Form N‑CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at www.troweprice.com/prospectus info troweprice.com |
| Material Fund Change Notice [Text Block] | |
| Additional Information Phone Number | 1‑800‑638‑5660 |
| Additional Information Email | info@troweprice.com</span>" id="sjs-B89"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 17.3333px; margin: 0px; overflow: visible; text-align: justify;">info@troweprice.com</span> |
| Additional Information Website | www.troweprice.com/prospectus |
| Expenses [Text Block] | What were the fund costs for the last six months? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Floating Rate Fund - Z Class $1 0.02% |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.02% |
| AssetsNet | $ 3,771,261,000 |
| Holdings Count | Holding | 325 |
| InvestmentCompanyPortfolioTurnover | 61.30% |
| Additional Fund Statistics Significance or Limits [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,771,261 Number of Portfolio Holdings 325 |
| Holdings [Text Block] | BBB/BB Rated and Above 1.5 % BB Rated 13.6 BB/B Rated 6.4 B Rated 57.0 B/CCC Rated 2.4 CCC Rated and Below 10.6 Not Rated 3.3 Short-Term Holdings 5.2 |
| Largest Holdings [Text Block] | HUB International 2.3 % AssuredPartners 2.3 Cloud Software Group 2.2 Applied Systems 2.2 UKG 1.9 Asurion 1.8 Ellucian Holdings 1.7 Medline Borrower 1.6 Epicor Software 1.6 LifePoint Health 1.6 |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | www.troweprice.com/paperless |
| Shareholder Report, Holdings (Details) | Nov. 30, 2024 |
| C000103068 | HUB International | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000103068 | AssuredPartners | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000103068 | Cloud Software Group | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000103068 | Applied Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000103068 | UKG | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000103068 | Asurion | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000103068 | Ellucian Holdings | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000103068 | Medline Borrower | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000103068 | Epicor Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000103068 | LifePoint Health | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000103068 | BBB/BB Rated and Above | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000103068 | BB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| C000103068 | BB/B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000103068 | B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57% |
| C000103068 | B/CCC Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000103068 | CCC Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| C000103068 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000103068 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000103069 | HUB International | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000103069 | AssuredPartners | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000103069 | Cloud Software Group | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000103069 | Applied Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000103069 | UKG | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000103069 | Asurion | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000103069 | Ellucian Holdings | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000103069 | Medline Borrower | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000103069 | Epicor Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000103069 | LifePoint Health | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000103069 | BBB/BB Rated and Above | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000103069 | BB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| C000103069 | BB/B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000103069 | B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57% |
| C000103069 | B/CCC Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000103069 | CCC Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| C000103069 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000103069 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000177200 | HUB International | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000177200 | AssuredPartners | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000177200 | Cloud Software Group | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000177200 | Applied Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000177200 | UKG | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000177200 | Asurion | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000177200 | Ellucian Holdings | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000177200 | Medline Borrower | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000177200 | Epicor Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000177200 | LifePoint Health | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000177200 | BBB/BB Rated and Above | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000177200 | BB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| C000177200 | BB/B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000177200 | B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57% |
| C000177200 | B/CCC Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000177200 | CCC Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| C000177200 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000177200 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000219333 | HUB International | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000219333 | AssuredPartners | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000219333 | Cloud Software Group | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000219333 | Applied Systems | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000219333 | UKG | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000219333 | Asurion | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000219333 | Ellucian Holdings | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000219333 | Medline Borrower | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000219333 | Epicor Software | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000219333 | LifePoint Health | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000219333 | BBB/BB Rated and Above | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000219333 | BB Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| C000219333 | BB/B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000219333 | B Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 57% |
| C000219333 | B/CCC Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000219333 | CCC Rated and Below | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| C000219333 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000219333 | Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
