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Intangible Assets, net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible assets subject to amortization: |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 753.8 us-gaap_FiniteLivedIntangibleAssetsGross | $ 719.3 us-gaap_FiniteLivedIntangibleAssetsGross |
Intangible assets subject to amortization, Accumulated Amortization | (289.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (241.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Intangible assets |  |  |
Intangible assets, Gross Carrying Amount | 1,531.5 us-gaap_IntangibleAssetsGrossExcludingGoodwill | 1,454.8 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Changes in intangible assets due to foreign currency translation losses | 8.1 rs_IntangibleAssetsExcludingGoodwillForeignCurrencyTranslationAdjustment |  |
Impairment of intangible assets | 0 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 14.9 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill | 2.5 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Amortization expense for intangible assets | 56.7 us-gaap_AmortizationOfIntangibleAssets | 54.9 us-gaap_AmortizationOfIntangibleAssets | 45.4 us-gaap_AmortizationOfIntangibleAssets
Summary of estimated aggregate amortization expense for each of the next five years |  |  |
2015 | 57.1 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |
2016 | 55.4 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 50.9 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 44.8 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 44.0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
2014 acquisitions |  |  |
Intangible assets |  |  |
Intangible assets acquired, excluding goodwill | 92.6 rs_IntangibleAssetsExcludingGoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = rs_FoxAluminiumServicesUkNisMember |  |
Trade names |  |  |
Intangible assets not subject to amortization: |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount | 777.7 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 735.5 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Intangible assets |  |  |
Impairment of intangible assets |  | 14.9 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Covenants not to compete |  |  |
Intangible assets subject to amortization: |  |  |
Life in Years | 4 years 3 months 18 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | 2.3 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 8.0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Intangible assets subject to amortization, Accumulated Amortization | (1.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | (7.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Loan fees |  |  |
Intangible assets subject to amortization: |  |  |
Life in Years | 3 years 9 months 18 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | 41.5 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember | 41.5 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember |
Intangible assets subject to amortization, Accumulated Amortization | (27.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember | (24.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember |
Customer lists/relationships |  |  |
Intangible assets subject to amortization: |  |  |
Life in Years | 14 years 3 months 18 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | 694.7 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | 654.3 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |
Intangible assets subject to amortization, Accumulated Amortization | (249.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember | (200.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember |
Software - internal use |  |  |
Intangible assets subject to amortization: |  |  |
Life in Years | 10 years |  |
Intangible assets subject to amortization, Gross Carrying Amount | 8.1 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 8.1 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
Intangible assets subject to amortization, Accumulated Amortization | (7.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | (6.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
Other |  |  |
Intangible assets subject to amortization: |  |  |
Life in Years | 5 years 2 months 12 days |  |
Intangible assets subject to amortization, Gross Carrying Amount | 7.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 7.4 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Intangible assets subject to amortization, Accumulated Amortization | $ (4.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ (2.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |

X
- Definition The aggregate amount of intangible assets acquired in the period, excluding goodwill, and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third 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 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second 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 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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