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Summary of Significant Accounting Policies, Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Accounting policies additional disclosures |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Advertising costs |  |  |  |  |  |  |  |  | $ 0.4 | $ 1.2 | $ 0.6
Research and development costs |  |  |  |  |  |  |  |  | 10.2 | 9.5 | 8.9
Lower of cost or market inventory write-down | $ 0.0 | $ 0.0 | $ 0.0 | $ 4.9 | $ 2.6 | $ 0.0 | $ 0.0 | $ 0.0 | 4.9 | 2.6 | 0.0
Excess of current cost over the stated LIFO value of inventory | (8.5) |  |  |  | (24.1) |  |  |  | (8.5) | (24.1) |
Non-cash impairment charges |  |  |  |  |  |  |  |  | 2.8 | 0.1 | $ 1.5
Impairment of the carrying value of goodwill | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 |
Undiscounted workers' compensation liabilities | 26.8 |  |  |  | 23.5 |  |  |  | $ 26.8 | $ 23.5 |
Discount rate used in estimating liabilities for worker compensation claims |  |  |  |  |  |  |  |  | 2.00% | 1.75% |
Accrued employee healthcare benefits | 3.6 |  |  |  | $ 3.2 |  |  |  | $ 3.6 | $ 3.2 |
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 |  |  |  |  |  |  |  |  | 60 days |  |
Number of days to maturity for debt investment securities to be classified as cash and cash equivalents |  |  |  |  |  |  |  |  | 90 days |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting policies additional disclosures |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net | $ 3.2 |  |  |  |  |  |  |  | $ 3.2 |  |

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