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Revenues:Recognition (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Distribution | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Customer Rebates and Allowances | $ 63.2 |  | $ 63.2 |  | $ 45.5
Building Materials Distribution [Member] |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Number of Primary Distribution Methods | 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 | $ 40.8 | $ 34.3 | $ 74.3 | $ 63.6 |

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