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Other Income, net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant components of Other (expense) income, net |  |  |
Other income, net | $ 10.8 us-gaap_OtherNonoperatingIncomeExpense | $ 3.9 us-gaap_OtherNonoperatingIncomeExpense | $ 8.6 us-gaap_OtherNonoperatingIncomeExpense
Investment income from life insurance policies |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | 51.3 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_InvestmentIncomeFromLifeInsurancePoliciesMember | 48.8 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_InvestmentIncomeFromLifeInsurancePoliciesMember | 44.2 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_InvestmentIncomeFromLifeInsurancePoliciesMember
Interest expense on life insurance policy loans |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | (52.5)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_InterestExpenseMember | (47.8)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_InterestExpenseMember | (44.2)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_InterestExpenseMember
Gain on acquisition achieved in stages |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | 11.4 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_GainOnAcquistionAchievedInStagesMember |  |
Life insurance policy cost of insurance |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | (9.2)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_LifeInsurancePolicyCostOfInsuranceMember | (8.5)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_LifeInsurancePolicyCostOfInsuranceMember | (7.8)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_LifeInsurancePolicyCostOfInsuranceMember
Income from life insurance policy redemptions |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net |  | 5.0 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_IncomeFromLifeInsurancePolicyRedemptionMember | 3.5 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_IncomeFromLifeInsurancePolicyRedemptionMember
Foreign currency transaction (losses) gains |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | 3.1 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_ForeignCurrencyGainLossMember | (2.6)us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_ForeignCurrencyGainLossMember | 1.7 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_ForeignCurrencyGainLossMember
Rental income |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | 1.9 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_RentalIncomeNonoperatingMember | 2.9 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_RentalIncomeNonoperatingMember | 2.6 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_RentalIncomeNonoperatingMember
Interest income |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | 1.4 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_InterestIncomeMember | 1.0 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_InterestIncomeMember | 1.4 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = us-gaap_InterestIncomeMember
Equity in earnings of unconsolidated entities |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | 2.2 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_IncomeLossFromEquityMethodInvestmentMember | 2.3 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_IncomeLossFromEquityMethodInvestmentMember | 2.2 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_IncomeLossFromEquityMethodInvestmentMember
All other, net |  |  |
Significant components of Other (expense) income, net |  |  |
Other income, net | $ 1.2 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_MiscellaneousOtherNonoperatingIncomeExpenseMember | $ 2.8 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_MiscellaneousOtherNonoperatingIncomeExpenseMember | $ 5.0 us-gaap_OtherNonoperatingIncomeExpense / rs_ComponentOfOtherNonoperatingIncomeExpenseAxis = rs_MiscellaneousOtherNonoperatingIncomeExpenseMember

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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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