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Debt (Details 2) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 04, 2013 item | Dec. 31, 2014 | Nov. 30, 2006 item | Apr. 12, 2013 | Dec. 31, 2013
Debt |  |  |  |  |
Debt outstanding |  | $ 2,319.1 us-gaap_DebtInstrumentCarryingAmount |  |  | $ 2,112.3 us-gaap_DebtInstrumentCarryingAmount
Ownership interest in domestic subsidiaries (as a percent) |  | 100.00%rs_MajorityInterestOwnershipPercentageByParent |  |  |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
2015 |  | 93.9 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |
2016 |  | 440.9 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |
2017 |  | 50.5 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |
2018 |  | 974.3 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |
2019 |  | 0.6 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |
Thereafter |  | 758.9 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |
Total |  | 2,319.1 us-gaap_LongTermDebt |  |  |
Third Amended and Restated Credit Agreement |  |  |  |  |
Debt |  |  |  |  |
Number of banks as lenders | 26 rs_LineOfCreditFacilityBankLendersNumber / us-gaap_FinancialInstrumentAxis = rs_ThirdAmendedAndRestatedCreditAgreementAndSeniorUnsecuredNotesDueApril2023IndentureMember |  |  |  |
Unsecured revolving credit facility |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity of the credit facility | 1,500.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember |  |  | 1,500.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember |
Commitment fee on unused portion of revolving credit facility (as a percent) |  | 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember |  |  |
Weighted average fixed interest rate (as a percent) |  | 1.42%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember |  |  | 1.41%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember
Letters of credit outstanding |  | 59.2 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember |  |  |
Additional amount of letters of credit available to be issued |  | 765.8 rs_LettersOfCreditAdditionalIssuanceCapacity / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember |  |  |
Unsecured revolving credit facility | Third Amended and Restated Credit Agreement |  |  |  |  |
Debt |  |  |  |  |
Increased maximum borrowing capacity under the credit subject to approval of the lenders and certain other conditions | 500.0 rs_LineOfCreditFacilityContingentIncreaseToMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember / us-gaap_FinancialInstrumentAxis = rs_ThirdAmendedAndRestatedCreditAgreementAndSeniorUnsecuredNotesDueApril2023IndentureMember |  |  |  |
Unsecured revolving credit facility | LIBOR |  |  |  |  |
Debt |  |  |  |  |
Variable interest rate |  | LIBOR |  |  |
Interest rate added to base (as a percent) |  | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Unsecured revolving credit facility | Bank prime rate |  |  |  |  |
Debt |  |  |  |  |
Variable interest rate |  | bank prime rate |  |  |
Interest rate added to base (as a percent) |  | 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |  |
Senior Unsecured Notes - Publicly Traded |  |  |  |  |
Debt |  |  |  |  |
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating |  | 101.00%rs_DebtRedemptionPriceDueToChangeOfControlAndDowngradeOfCreditRatingAsPercentageOfPrincipalAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesPubliclyTradedMember |  |  |
Senior unsecured notes due November 20, 2006 |  |  |  |  |
Debt |  |  |  |  |
Issuance of debt |  |  | 600.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesIssuedNovember2006Member |  |
Number of tranches comprising the debt issuance |  |  | 2 rs_DebtInstrumentIssuedTranchesNumber / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesIssuedNovember2006Member |  |
Senior unsecured notes due November 15, 2016 |  |  |  |  |
Debt |  |  |  |  |
Debt outstanding |  | 350.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2016Member |  |  | 350.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2016Member
Interest rate (as a percent) |  |  | 6.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2016Member |  |
Issuance of debt |  |  | 350.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2016Member |  |
Senior unsecured notes due November 15, 2036 |  |  |  |  |
Debt |  |  |  |  |
Debt outstanding |  | 250.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2036Member |  |  | 250.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2036Member
Interest rate (as a percent) |  |  | 6.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2036Member |  |
Issuance of debt |  |  | 250.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDueNovember2036Member |  |
Senior unsecured notes due April 15, 2023 |  |  |  |  |
Debt |  |  |  |  |
Debt outstanding |  | 500.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDue2023Member |  |  | 500.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDue2023Member
Interest rate (as a percent) |  |  |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDue2023Member |
Issuance of debt |  |  |  | 500.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = rs_SeniorUnsecuredNotesDue2023Member |
Unsecured Revolving Credit Facility and Senior Unsecured Notes |  |  |  |  |
Debt |  |  |  |  |
Ownership interest in domestic subsidiaries (as a percent) |  | 100.00%rs_MajorityInterestOwnershipPercentageByParent / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityAndSeniorUnsecuredNotesMember |  |  |
Minimum percentage of consolidated EBITDA required for the entity and subsidiary guarantors |  | 80.00%rs_DebtInstrumentCovenantPercentageOfEBITDAParentAndSubsidiaryGuarantorsMinimum / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityAndSeniorUnsecuredNotesMember |  |  |
Minimum percentage of consolidated tangible assets required for the entity and subsidiary guarantors |  | 80.00%rs_DebtInstrumentCovenantPercentageOfTangibleAssetsParentAndSubsidiaryGuarantorsMinimum / us-gaap_DebtInstrumentAxis = rs_UnsecuredRevolvingCreditFacilityAndSeniorUnsecuredNotesMember |  |  |
Term loan expiring April 4, 2018 |  |  |  |  |
Debt |  |  |  |  |
Annual amortization of term loan during the first year (as a percent) |  | 5.00%rs_DebtInstrumentTermLoanAnnualAmortizationPercentageForFirstYear / us-gaap_DebtInstrumentAxis = rs_TermLoanDueApril2018Member |  |  |
Annual amortization of term loan during the second year (as a percent) |  | 5.00%rs_DebtInstrumentTermLoanAnnualAmortizationPercentageForSecondYear / us-gaap_DebtInstrumentAxis = rs_TermLoanDueApril2018Member |  |  |
Annual amortization of term loan during the third year (as a percent) |  | 10.00%rs_DebtInstrumentTermLoanAnnualAmortizationPercentageForThirdYear / us-gaap_DebtInstrumentAxis = rs_TermLoanDueApril2018Member |  |  |
Annual amortization of term loan during the fourth year (as a percent) |  | 10.00%rs_DebtInstrumentTermLoanAnnualAmortizationPercentageForFourthYear / us-gaap_DebtInstrumentAxis = rs_TermLoanDueApril2018Member |  |  |
Annual amortization of term loan during the fifth year (as a percent) |  | 10.00%rs_DebtInstrumentTermLoanAnnualAmortizationPercentageForFifthYear / us-gaap_DebtInstrumentAxis = rs_TermLoanDueApril2018Member |  |  |
Term loan expiring April 4, 2018 | Third Amended and Restated Credit Agreement |  |  |  |  |
Debt |  |  |  |  |
Issuance of debt | 500.0 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = rs_TermLoanDueApril2018Member / us-gaap_FinancialInstrumentAxis = rs_ThirdAmendedAndRestatedCreditAgreementAndSeniorUnsecuredNotesDueApril2023IndentureMember |  |  |  |
Other separate revolving credit facilities |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity of the credit facility |  | 83.3 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rs_OtherRevolvingCreditFacilityMember |  |  |
Combined outstanding balances of revolving credit facilities |  | 48.3 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = rs_OtherRevolvingCreditFacilityMember |  |  | 9.5 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = rs_OtherRevolvingCreditFacilityMember
IRB | Metals USA |  |  |  |  |
Debt |  |  |  |  |
Debt outstanding |  | 11.5 us-gaap_DebtInstrumentCarryingAmount / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember / us-gaap_DebtInstrumentAxis = rs_IndustrialRevenueBondsMember |  |  | 11.9 us-gaap_DebtInstrumentCarryingAmount / us-gaap_BusinessAcquisitionAxis = rs_MetalsUSAHoldingCorpMember / us-gaap_DebtInstrumentAxis = rs_IndustrialRevenueBondsMember
Mortgage obligations | Travel Main |  |  |  |  |
Debt |  |  |  |  |
Debt outstanding |  | 41.8 us-gaap_DebtInstrumentCarryingAmount / us-gaap_BusinessAcquisitionAxis = rs_TravelMainHoldingsLLCMember / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember |  |  | 43.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_BusinessAcquisitionAxis = rs_TravelMainHoldingsLLCMember / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember
Interest rate (as a percent) |  | 6.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = rs_TravelMainHoldingsLLCMember / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember |  |  |
Lump sum payment on maturity |  | $ 39.2 rs_DebtInstrumentPaymentAtMaturity / us-gaap_BusinessAcquisitionAxis = rs_TravelMainHoldingsLLCMember / us-gaap_DebtInstrumentAxis = us-gaap_MortgagesMember |  |  |

X
- Definition Represents the minimum percentage of consolidated earnings before interest, taxes, depreciation and amortization (EBITDA), which the subsidiary guarantors together with the entity are required to maintain. + References No definition available. + Details
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- Definition Represents the percentage of consolidated tangible assets which the subsidiary guarantors together with the entity required to own under the terms of the financial covenants. + References No definition available. + Details
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- Definition Represents the number of tranches comprising the debt issuance. + References No definition available. + Details
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- Definition Represents the lump sum amount payable at the maturity of the debt instrument. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the percentage of annual amortization of term loan during the fifth year. + References No definition available. + Details
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Namespace Prefix: | rs_
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- Definition Represents the percentage of annual amortization of term loan during the first year. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | num:percentItemType
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- Definition Represents the percentage of annual amortization of term loan during the fourth year. + References No definition available. + Details
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Namespace Prefix: | rs_
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- Definition Represents the percentage of annual amortization of term loan during the second year. + References No definition available. + Details
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- Definition Represents the percentage of annual amortization of term loan during the third year. + References No definition available. + Details
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- Definition Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be redeemed by the entity in the event of a change of control or downgrade of the entity's credit rating. + References No definition available. + Details
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- Definition The total additional amount of letters of credit available to be issued as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the number of banks as lenders of the line of credit facility. + References No definition available. + Details
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Namespace Prefix: | rs_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Increased maximum borrowing capacity under the credit subject to approval of the lenders and certain other conditions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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