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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Aug. 01, 2014
country
item
Acquisitions        
Net sales $ 2,614.4us-gaap_SalesRevenueNet $ 2,553.0us-gaap_SalesRevenueNet    
Allocation of the total purchase price of 2014 acquisitions to the fair value of the assets acquired and liabilities assumed        
Goodwill 1,730.3us-gaap_Goodwill   1,736.4us-gaap_Goodwill  
Fox        
Acquisitions        
Net sales 9.8us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxMetalsAndAlloysIncMember
     
AMS        
Acquisitions        
Net sales 68.1us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= rs_AluminiumServicesUkLimitedMember
     
Number of locations of the acquiree entity       8rs_BusinessAcquisitionNumberOfLocationsOfAcquireeEntity
/ us-gaap_BusinessAcquisitionAxis
= rs_AluminiumServicesUkLimitedMember
Number of countries of the acquiree entity       4us-gaap_NumberOfCountriesInWhichEntityOperates
/ us-gaap_BusinessAcquisitionAxis
= rs_AluminiumServicesUkLimitedMember
AMS | Minimum        
Acquisitions        
Number of countries in which entity's customers operate       40rs_NumberOfCountriesInWhichEntityCustomersOperates
/ us-gaap_BusinessAcquisitionAxis
= rs_AluminiumServicesUkLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
NIS        
Acquisitions        
Net sales 4.5us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= rs_NorthernIllinoisSteelSupplyCoMember
     
2014 acquisitions        
Allocation of the total purchase price of 2014 acquisitions to the fair value of the assets acquired and liabilities assumed        
Cash 1.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Accounts receivable 67.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Inventories 89.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Property, plant and equipment 23.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Goodwill 51.2us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Intangible assets subject to amortization 37.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Intangible assets not subject to amortization 39.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Other current and long-term assets 1.5rs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Total assets acquired 310.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Deferred taxes 9.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Current and long-term debt 39.2rs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAndLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Other current and long-term liabilities 53.1rs_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAndNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Total liabilities assumed 101.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember
     
Net assets acquired $ 209.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= rs_FoxAluminiumServicesUkNisMember