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Intangible Assets, net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	$ 748.1us-gaap_FiniteLivedIntangibleAssetsGross		$ 753.8us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets subject to amortization, Accumulated Amortization	(302.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization		(289.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets
Intangible assets, Gross Carrying Amount	1,522.6us-gaap_IntangibleAssetsGrossExcludingGoodwill		1,531.5us-gaap_IntangibleAssetsGrossExcludingGoodwill
Amortization expense for intangible assets	14.3us-gaap_AmortizationOfIntangibleAssets	14.1us-gaap_AmortizationOfIntangibleAssets
Changes in intangible assets due to foreign currency translation losses	7.1rs_IntangibleAssetsExcludingGoodwillForeignCurrencyTranslationAdjustment
Summary of estimated aggregate amortization expense for the remaining nine months of 2015 and each of the next five years
2015	42.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016	55.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2017	50.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2018	44.4us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2019	43.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2020	43.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization, Gross Carrying Amount	774.5us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember		777.7us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Covenants not to compete
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	2.3us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember		2.3us-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		(1.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Weighted average amortizable life in years	4 years 3 months 18 days
Loan fees
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	41.5us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember		41.5us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember
Intangible assets subject to amortization, Accumulated Amortization	(28.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember		(27.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = rs_LoanProcessingFeesMember
Weighted average amortizable life in years	3 years 9 months 18 days
Customer lists/relationships
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	689.1us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember		694.7us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Intangible assets subject to amortization, Accumulated Amortization	(260.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember		(249.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Weighted average amortizable life in years	14 years 2 months 12 days
Software - internal use
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	8.1us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember		8.1us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Intangible assets subject to amortization, Accumulated Amortization	(7.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember		(7.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Weighted average amortizable life in years	10 years
Other
Intangible assets subject to amortization:
Intangible assets subject to amortization, Gross Carrying Amount	7.1us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember		7.2us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Intangible assets subject to amortization, Accumulated Amortization	$ (4.8)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember		$ (4.5)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Weighted average amortizable life in years	5 years 1 month 6 days

X

- Definition

The increase or decrease to the recorded value of intangible assets, excluding goodwill, for foreign currency translation adjustments.

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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.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the 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

No definition available.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth 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

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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

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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

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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