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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
	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	$ 2,576.7us-gaap_SalesRevenueNet	$ 2,705.1us-gaap_SalesRevenueNet	$ 2,616.8us-gaap_SalesRevenueNet	$ 2,553.0us-gaap_SalesRevenueNet	$ 2,306.7us-gaap_SalesRevenueNet	$ 2,443.5us-gaap_SalesRevenueNet	$ 2,448.3us-gaap_SalesRevenueNet	$ 2,025.3us-gaap_SalesRevenueNet	$ 10,451.6us-gaap_SalesRevenueNet	$ 9,223.8us-gaap_SalesRevenueNet	$ 8,442.3us-gaap_SalesRevenueNet
Number of joint ventures in which the entity has a noncontrolling interest									2rs_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												11.4us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember
Total purchase price												57.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember
Noncontrolling interest												22.6us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rs_AceroPrimeSDeRLDeCVMember
Net sales	7.0us-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	1,563.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember								1,563.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember
Net sales									$ 1,780.0us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember				$ 1,240.0us-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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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.

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