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Equity - Common Stock (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 $ / shares | Mar. 31, 2024 $ / shares | Mar. 31, 2023 $ / shares | Mar. 31, 2022 $ / shares | Mar. 31, 2021 $ / shares | Dec. 31, 2024 Y item $ / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2022 $ / shares
Common Stock |  |  |  |  |  |  |  |
The number of consecutive years the company has paid regular common stock quarterly dividends | Y |  |  |  |  |  | 65 |  |
Votes per share of common stock | item |  |  |  |  |  | 1 |  |
Common stock quarterly dividend per share (in dollars per share) | $ / shares | $ 1.2 | $ 1.1 | $ 1 | $ 0.875 | $ 0.6875 | $ 4.4 | $ 4 | $ 3.5

X
- Definition The number of votes per share of common stock on all matters except the election of members to the Board of Directors. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of consecutive years the company has paid regular common stock quarterly dividends. + References No definition available. + Details
Name: | rs_NumberOfConsecutiveYearsOfRegularCommonStockQuarterlyDividends
Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration