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v3.8.0.1

Revenues:Recognition (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Distribution | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Customer Rebates and Allowances | $ 46.8 |  | $ 45.5
Building Materials Distribution [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
NumberofPrimaryDistributionMethods | Distribution | 2 |  |
Building Materials Distribution [Member] | Shipping and Handling [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cost of Goods and Services Sold | $ 33.6 | $ 29.3 |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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