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Summary of Significant Accounting Policies, Narrative (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Accounting policies additional disclosures |  |  |  |  |
Number of operating segments | segment |  | 1 |  |  |
Advertising costs |  | $ 0.3 | $ 0.7 | $ 0.4 |
Research and development costs |  | 9.8 | 10.0 | 10.2 |
Lower of cost or market inventory write-down |  | 0.0 | 0.0 | 4.9 |
Excess of current cost over the stated LIFO value of inventory |  | 31.7 | 24.3 |  |
Non-cash asset impairment charges |  | 1.4 | 19.2 | $ 2.8 |
Undiscounted workers' compensation liabilities |  | $ 27.6 | $ 24.8 |  |
Discount rate used in estimating liabilities for worker compensation claims |  | 3.00% | 2.25% |  |
Accrued employee healthcare benefits |  | $ 3.6 | $ 3.5 |  |
Retained earnings | $ 95.6 | $ 150.2 | $ 85.5 |  |
Minimum |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |
Period over which accounts receivable is due, days |  | 30 days |  |  |
Number of days in maturity for debt investment securities to be classified as short-term investments |  | 90 days |  |  |
Maximum |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |
Period over which accounts receivable is due, days |  | 90 days |  |  |
Number of days to maturity for debt investment securities to be classified as cash and cash equivalents |  | 90 days |  |  |
Scenario, Forecast | Accounting Standards Update 2016-02 | Minimum |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |
Right-of-use asset |  |  |  |  | $ 20.0
Lease liability |  |  |  |  | 20.0
Scenario, Forecast | Accounting Standards Update 2016-02 | Maximum |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |
Right-of-use asset |  |  |  |  | 30.0
Lease liability |  |  |  |  | $ 30.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |
Tax impact of cumulative increase to retained earnings | (3.3) |  |  |  |
Retained earnings | 10.1 | $ (15.5) |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2016-01 |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |
Retained earnings | $ 0.6 |  |  |  |

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