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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 255 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Apr. 21, 2015 | Apr. 30, 2015 | Mar. 27, 2015 | Mar. 25, 2014 | May 01, 2015
Equity |  |  |  |  |  |  |  |
Proceed from option exercises | $ 6.1 us-gaap_ProceedsFromStockOptionsExercised | $ 8.4 us-gaap_ProceedsFromStockOptionsExercised |  |  |  |  |  |
Common stock dividend quarterly declared and paid per share (in dollars per share) | $ 0.40 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.35 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Number of shares repurchased under stock repurchase plan | 3,187,235 us-gaap_StockRepurchasedDuringPeriodShares |  | 19,400,000 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |
Average costs per share | $ 58.02 rs_StockRepurchaseAcquiredAverageCostPerShare |  | $ 27.31 rs_StockRepurchaseAcquiredAverageCostPerShare |  |  |  |  |
Value of shares repurchased | 184.9 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Stock options exercised (in shares) | 109,556 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |
Dividends paid | 31.7 us-gaap_PaymentsOfDividendsCommonStock | 27.1 us-gaap_PaymentsOfDividendsCommonStock |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Number of shares repurchased under stock repurchase plan |  |  |  |  | 251,165 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Average costs per share |  |  |  |  | $ 59.97 rs_StockRepurchaseAcquiredAverageCostPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Value of shares repurchased |  |  |  |  | 15.1 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase plan |  |  |  |  |  |  |  | 3,684,833 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Shares outstanding ( as a percent) |  |  |  |  |  |  |  | 5.00%rs_StockRepurchaseProgramPercentageOfSharesOutstandingUnderRepurchasePlan / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) |  |  |  | $ 0.40 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Pending settlement |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Number of shares repurchased under stock repurchase plan | 231,626 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |  |  |  |  |
Value of shares repurchased | 13.7 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember |  |  |  |  |  |  |
Restricted stock, 2015 grant |  |  |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  |  |  | 507,760 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rs_RestrictedStockUnitsRSU2015Member |  |
Share of common stock |  |  |  |  |  |  | 1 rs_ShareOfCommonStock / us-gaap_AwardTypeAxis = rs_RestrictedStockUnitsRSU2015Member |
The number of grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). |  |  |  |  |  | 185,450 rs_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodOnTheBasisOfServiceAndPerformanceCriteria / us-gaap_AwardTypeAxis = rs_RestrictedStockUnitsRSU2015Member |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 507,760 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = rs_RestrictedStockUnitsRSU2015Member |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Performance targets Period |  |  |  |  |  | 3 years |  |
Restricted stock, 2012 grant |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Restricted stock units that vested | 258,719 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_AwardTypeAxis = rs_RestrictedStockUnitsRSU2012Member |  |  |  |  |  |  |
Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |  |  |
Restricted stock granted (in shares) | 557,760 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Fair value of restricted stock granted (in dollars per share) | $ 59.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) | 846,760 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Granted (in shares) | 557,760 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Vested (in shares) | (63,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Canceled (in shares) | (82,850)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Unvested at the end of the period (in shares) | 1,258,670 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 1,258,670 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |
Shares reserved for future grants (all plans) | 2,356,894 rs_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesReservedForFutureIssue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 65.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Granted (in dollars per shares) | $ 59.27 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Vested (in dollars per shares) | $ 57.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Canceled (in dollars per shares) | $ 58.66 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Unvested at the end of the period (in dollars per shares) | $ 63.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | $ 63.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |
Dividend equivalents | $ 1.0 rs_PaymentOfDividendEquivalents / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Performance targets Period |  |  |  |  |  | 3 years |  |
Restricted stock units (RSUs) | Time-based | CEO |  |  |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  |  |  | 10,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = rs_RestrictedStockWithServiceConditionsMember |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 10,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = rs_RestrictedStockWithServiceConditionsMember |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Performance targets Period |  |  |  |  |  | 18 months |  |
Restricted stock units (RSUs) | Performance-based | CEO |  |  |  |  |  |  |  |
Share Based Compensation |  |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  |  |  | 40,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = rs_RestrictedStockWithPerformanceConditionsMember |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 40,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember / us-gaap_VestingAxis = rs_RestrictedStockWithPerformanceConditionsMember |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Performance targets Period |  |  |  |  |  | 18 months |  |

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- Definition Represents the number of stock grants made during the period on the basis of service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. This element is used when state law does not recognize treasury stock. + References No definition available. + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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