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

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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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