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Summary of Significant Accounting Policies, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 01, 2018
Significant accounting policies |  |  |  |  |  |
Excess of current cost over the stated LIFO value of inventory | $ 42.9 |  | $ 42.9 |  | $ 24.3 |
Interest expense capitalized | 0.4 | $ 0.7 | 1.3 | $ 1.9 |  |
Workers compensation liability | 27.9 |  | $ 27.9 |  | $ 24.8 |
Workers' compensation accrual, discount rate (percent) |  |  | 3.00% |  | 2.25% |
Accrued liabilities for employee healthcare benefits | $ 3.1 |  | $ 3.1 |  | $ 3.5 |
Shares available for award (shares) | 577,300 |  | 577,300 |  |  |
Retained earnings | $ 135.6 |  | $ 135.6 |  | $ 85.5 | $ 95.6
Accrued salaries, wages and related expenses |  |  |  |  |  |
Significant accounting policies |  |  |  |  |  |
Accrued salaries, wages and related expenses | 10.6 |  | 10.6 |  |  |
Accounting Standards Update 2016-01 |  |  |  |  |  |
Significant accounting policies |  |  |  |  |  |
Retained earnings |  |  |  |  |  | 0.4
Tax impact |  |  |  |  |  | 0.2
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
Significant accounting policies |  |  |  |  |  |
Retained earnings | $ (13.7) |  | $ (13.7) |  |  | 10.1
Tax impact |  |  |  |  |  | $ 3.3

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