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Condensed Consolidating Financial Statements (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Apr. 30, 2013
Nov. 30, 2006
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Consolidating Balance Sheet            
Ownership interest in domestic subsidiaries (as a percent)     100.00%rs_MajorityInterestOwnershipPercentageByParent      
Assets            
Cash and cash equivalents     $ 106.2us-gaap_CashAndCashEquivalentsAtCarryingValue $ 83.6us-gaap_CashAndCashEquivalentsAtCarryingValue $ 97.6us-gaap_CashAndCashEquivalentsAtCarryingValue $ 84.6us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net     1,144.6us-gaap_AccountsReceivableNetCurrent 983.5us-gaap_AccountsReceivableNetCurrent    
Inventories     1,752.1us-gaap_InventoryNet 1,540.0us-gaap_InventoryNet    
Income taxes receivable       33.9us-gaap_IncomeTaxesReceivable    
Other current assets     118.2us-gaap_OtherAssetsCurrent 97.9us-gaap_OtherAssetsCurrent    
Total current assets     3,121.1us-gaap_AssetsCurrent 2,738.9us-gaap_AssetsCurrent    
Property, plant and equipment, net     1,656.4us-gaap_PropertyPlantAndEquipmentNet 1,603.9us-gaap_PropertyPlantAndEquipmentNet    
Goodwill     1,736.4us-gaap_Goodwill 1,691.6us-gaap_Goodwill 1,314.6us-gaap_Goodwill 1,244.3us-gaap_Goodwill
Intangible assets, net     1,241.6us-gaap_IntangibleAssetsNetExcludingGoodwill 1,213.8us-gaap_IntangibleAssetsNetExcludingGoodwill    
Other assets     81.1us-gaap_OtherAssetsNoncurrent 92.8us-gaap_OtherAssetsNoncurrent    
Total assets     7,836.6us-gaap_Assets 7,341.0us-gaap_Assets    
Liabilities & Equity            
Accounts payable     286.5us-gaap_AccountsPayableCurrent 280.3us-gaap_AccountsPayableCurrent    
Accrued compensation and retirement costs     128.4us-gaap_EmployeeRelatedLiabilitiesCurrent 119.5us-gaap_EmployeeRelatedLiabilitiesCurrent    
Other current liabilities     154.0us-gaap_OtherLiabilitiesCurrent 137.1us-gaap_OtherLiabilitiesCurrent    
Current maturities of long-term debt and short-term borrowings     93.9us-gaap_DebtCurrent 36.5us-gaap_DebtCurrent    
Total current liabilities     662.8us-gaap_LiabilitiesCurrent 573.4us-gaap_LiabilitiesCurrent    
Long-term debt     2,222.3us-gaap_LongTermDebtNoncurrent 2,072.5us-gaap_LongTermDebtNoncurrent    
Other long-term liabilities     823.6us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent 810.7us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent    
Total Reliance shareholders' equity     4,099.0us-gaap_StockholdersEquity 3,874.6us-gaap_StockholdersEquity    
Noncontrolling interests     28.9us-gaap_MinorityInterest 9.8us-gaap_MinorityInterest    
Total equity     4,127.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 3,884.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 3,567.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 3,152.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity     7,836.6us-gaap_LiabilitiesAndStockholdersEquity 7,341.0us-gaap_LiabilitiesAndStockholdersEquity    
Senior Unsecured Notes - Publicly Traded            
Condensed Consolidating Balance Sheet            
Aggregate principal amount 1,100.0us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= rs_SeniorUnsecuredNotesPubliclyTradedMember
1,100.0us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= rs_SeniorUnsecuredNotesPubliclyTradedMember
       
Ownership interest in domestic subsidiaries (as a percent) 100.00%rs_MajorityInterestOwnershipPercentageByParent
/ us-gaap_LongtermDebtTypeAxis
= rs_SeniorUnsecuredNotesPubliclyTradedMember
100.00%rs_MajorityInterestOwnershipPercentageByParent
/ us-gaap_LongtermDebtTypeAxis
= rs_SeniorUnsecuredNotesPubliclyTradedMember
       
Reportable legal entities | Parent            
Assets            
Cash and cash equivalents     41.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
19.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
28.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Accounts receivable, net     72.7us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
64.4us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inventories     57.6us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
52.6us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income taxes receivable       34.4us-gaap_IncomeTaxesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other current assets     139.3us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
124.8us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets     311.5us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
295.9us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in subsidiaries     4,891.8rs_InvestmentsInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,647.7rs_InvestmentsInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property, plant and equipment, net     103.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
100.8us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Goodwill     23.8us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
23.8us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intangible assets, net     30.3us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
17.4us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany receivables     1,361.7rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,219.4rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets     22.7us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20.8us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets     6,745.6us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6,325.8us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Liabilities & Equity            
Accounts payable     29.2us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
29.1us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued compensation and retirement costs     23.9us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
21.1us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other current liabilities     65.2us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
53.5us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current maturities of long-term debt and short-term borrowings     43.8us-gaap_DebtCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
25.3us-gaap_DebtCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current liabilities     162.1us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
129.0us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term debt     2,170.8us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,019.2us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other long-term liabilities     313.7us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
303.0us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Reliance shareholders' equity     4,099.0us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,874.6us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total equity     4,099.0us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,874.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and equity     6,745.6us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
6,325.8us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Reportable legal entities | Guarantor Subsidiaries            
Assets            
Cash and cash equivalents     (8.3)us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(0.8)us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
13.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
10.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Accounts receivable, net     923.1us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,170.9us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories     1,454.2us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,344.8us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other current assets     38.5us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
40.8us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets     2,407.5us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,555.7us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investments in subsidiaries     299.9rs_InvestmentsInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
312.4rs_InvestmentsInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Property, plant and equipment, net     1,333.7us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,298.7us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Goodwill     1,571.0us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,555.7us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intangible assets, net     1,056.7us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,077.8us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany receivables     26.1rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
22.4rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other assets     52.5us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
66.6us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets     6,747.4us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6,889.3us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Liabilities & Equity            
Accounts payable     212.3us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
185.8us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued compensation and retirement costs     89.9us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
85.9us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other current liabilities     26.1us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
63.1us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Deferred income taxes     75.1us-gaap_DeferredTaxLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
75.2us-gaap_DeferredTaxLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current liabilities     403.4us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
410.0us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-term debt     5.7us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5.7us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany borrowings     1,242.5rs_IntercompanyBorrowingsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,550.6rs_IntercompanyBorrowingsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other long-term liabilities     456.2us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
466.5us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total Reliance shareholders' equity     4,633.4us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
4,450.1us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Noncontrolling interests     6.2us-gaap_MinorityInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6.4us-gaap_MinorityInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total equity     4,639.6us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
4,456.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities and equity     6,747.4us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
6,889.3us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Reportable legal entities | Non-Guarantor Subsidiaries            
Assets            
Cash and cash equivalents     72.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
64.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
56.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
58.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Accounts receivable, net     164.8us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
101.3us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Inventories     240.3us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
142.6us-gaap_InventoryNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other current assets     16.1us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
8.9us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current assets     493.8us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
317.5us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Property, plant and equipment, net     218.9us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
204.4us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Goodwill     141.6us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
112.1us-gaap_Goodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intangible assets, net     154.6us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
118.6us-gaap_IntangibleAssetsNetExcludingGoodwill
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany receivables     18.2rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
394.3rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other assets     5.9us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5.4us-gaap_OtherAssetsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total assets     1,033.0us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,152.3us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Liabilities & Equity            
Accounts payable     60.6us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
418.5us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accrued compensation and retirement costs     14.6us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
12.5us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other current liabilities     62.6us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
22.4us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Deferred income taxes     0.6us-gaap_DeferredTaxLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Current maturities of long-term debt and short-term borrowings     50.1us-gaap_DebtCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
11.2us-gaap_DebtCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current liabilities     188.5us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
464.6us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-term debt     45.8us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
47.6us-gaap_LongTermDebtNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany borrowings     163.5rs_IntercompanyBorrowingsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
85.5rs_IntercompanyBorrowingsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other long-term liabilities     54.1us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
41.2us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total Reliance shareholders' equity     558.4us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
510.0us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Noncontrolling interests     22.7us-gaap_MinorityInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3.4us-gaap_MinorityInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total equity     581.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
513.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total liabilities and equity     1,033.0us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,152.3us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ReportableLegalEntitiesMember
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Consolidating Adjustments            
Assets            
Accounts receivable, net     (16.0)us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(353.1)us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Income taxes receivable       (0.5)us-gaap_IncomeTaxesReceivable
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Other current assets     (75.7)us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(76.6)us-gaap_OtherAssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets     (91.7)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(430.2)us-gaap_AssetsCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Investments in subsidiaries     (5,191.7)rs_InvestmentsInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(4,960.1)rs_InvestmentsInSubsidiaries
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany receivables     (1,406.0)rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1,636.1)rs_IntercompanyReceivablesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets     (6,689.4)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(7,026.4)us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Liabilities & Equity            
Accounts payable     (15.6)us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(353.1)us-gaap_AccountsPayableCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Other current liabilities     0.1us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1.9)us-gaap_OtherLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Deferred income taxes     (75.7)us-gaap_DeferredTaxLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(75.2)us-gaap_DeferredTaxLiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current liabilities     (91.2)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(430.2)us-gaap_LiabilitiesCurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany borrowings     (1,406.0)rs_IntercompanyBorrowingsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(1,636.1)rs_IntercompanyBorrowingsNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Other long-term liabilities     (0.4)us-gaap_DeferredTaxAndOtherLiabilitiesNoncurrent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
     
Total Reliance shareholders' equity     (5,191.8)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(4,960.1)us-gaap_StockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total equity     (5,191.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(4,960.1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities and equity     $ (6,689.4)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
$ (7,026.4)us-gaap_LiabilitiesAndStockholdersEquity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember