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v3.19.1

Summary of Significant Accounting Policies, Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2017
Significant accounting policies |  |  |  |  |
Operating lease assets | $ 27.4 |  | $ 0.0 |  |
Operating Lease, Liability, Current | 3.5 |  |  |  |
Excess of current cost over the stated LIFO value of inventory | 17.2 |  | 31.7 |  |
Interest expense capitalized | 0.5 | $ 0.5 |  |  |
Workers compensation liability | $ 28.1 |  | $ 27.6 |  |
Workers' compensation accrual, discount rate (percent) | 2.50% |  | 3.00% |  |
Accrued liabilities for employee healthcare benefits | $ 3.4 |  | $ 3.6 |  |
Shares available for award (shares) | 503,379 |  |  |  |
Retained earnings | $ 168.0 |  | 150.2 |  |
Long-term portion of operating lease liabilities | 26.6 |  | $ 0.0 |  |
Cumulative-effect adjustment |  |  |  |  | $ 10.1
Accrued salaries, wages and related expenses |  |  |  |  |
Significant accounting policies |  |  |  |  |
Accrued salaries, wages and related expenses | $ 3.9 |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Significant accounting policies |  |  |  |  |
Operating lease assets |  |  |  | $ 29.0 |
Operating Lease, Liability, Current |  |  |  | 4.1 |
Long-term portion of operating lease liabilities |  |  |  | 27.4 |
Cumulative-effect adjustment |  |  |  | $ 0.0 |

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