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Joint Ventures and Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended |  |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 01, 2014 | Dec. 31, 2013 | Nov. 03, 2014 | Apr. 30, 2013
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,576.7 us-gaap_SalesRevenueNet | $ 2,705.1 us-gaap_SalesRevenueNet | $ 2,616.8 us-gaap_SalesRevenueNet | $ 2,553.0 us-gaap_SalesRevenueNet | $ 2,306.7 us-gaap_SalesRevenueNet | $ 2,443.5 us-gaap_SalesRevenueNet | $ 2,448.3 us-gaap_SalesRevenueNet | $ 2,025.3 us-gaap_SalesRevenueNet | $ 10,451.6 us-gaap_SalesRevenueNet | $ 9,223.8 us-gaap_SalesRevenueNet | $ 8,442.3 us-gaap_SalesRevenueNet |  |  |  |
Number of joint ventures in which the entity has a noncontrolling interest |  |  |  |  |  |  |  |  | 2 rs_NumberOfJointVentureInterestsInWhichEntityHasNoncontrollingInterest |  |  |  |  |  |
Valex Corp. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 97.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_ValexCorpMember |  |  |  |  |  |  |  | 97.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_ValexCorpMember |  |  |  |  |  |
Valex Corp. | People's Republic of China |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 92.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_ValexCorpMember / us-gaap_StatementGeographicalAxis = country_CN |  |  |  |  |  |  |  | 92.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_ValexCorpMember / us-gaap_StatementGeographicalAxis = country_CN |  |  |  |  |  |
Valex Corp. | South Korea |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 94.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_ValexCorpMember / us-gaap_StatementGeographicalAxis = country_KR |  |  |  |  |  |  |  | 94.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_ValexCorpMember / us-gaap_StatementGeographicalAxis = country_KR |  |  |  |  |  |
Indiana Pickling & Processing Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 56.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_IndianaPicklingAndProcessingCompanyMember |  |  |  |  |  |  |  | 56.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_IndianaPicklingAndProcessingCompanyMember |  |  |  |  |  |
Feralloy Processing Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 51.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_FeralloyProcessingCompanyMember |  |  |  |  |  |  |  | 51.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_FeralloyProcessingCompanyMember |  |  |  |  |  |
FP Structural Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 70.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_FPStructuralSolutionsMember |  |  |  |  |  |  |  | 70.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rs_FPStructuralSolutionsMember |  |  |  |  |  |
Eagle Steel Products, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = rs_EagleSteelProductsIncMember |  |  |  |  |  |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = rs_EagleSteelProductsIncMember |  |  |  |  |  |
Acero Prime S. de R.L. de C.V. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |  |  |  |  |  | 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |  |  | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |
Gain on equity interest |  |  |  |  |  |  |  |  |  |  |  | 11.4 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |
Total purchase price |  |  |  |  |  |  |  |  |  |  |  | 57.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |
Noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  | 22.6 us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |
Net sales | 7.0 us-gaap_SalesRevenueNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in investments other than equity method investment | 60.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |  |  |  |  |  | 60.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember |  |  |  |  |  |
Oregon Feralloy Partners LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_OregonFeralloyPartnersLLCMember |  |  |  |  |  |  |  | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_OregonFeralloyPartnersLLCMember |  |  |  |  |  |
Metals USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | 1,563.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember |  |  |  |  |  |  |  | 1,563.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 1,780.0 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember |  |  |  | $ 1,240.0 us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember |  |
Metals USA | Eagle Steel Products, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember / dei_LegalEntityAxis = rs_EagleSteelProductsIncMember
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Percentage of ownership for consolidation of financial statements | 50.00%rs_OwnershipPercentageByParentForConsolidation / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  | 50.00%rs_OwnershipPercentageByParentForConsolidation / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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