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Commitments and Contingencies, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Environmental Contingencies |  |  |  |
PeriodForFinalFeasibilityStudy | 12 months |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |
Rental expense | $ 8.2 | $ 7.9 | $ 8.5 |
Environmental accrual | $ 16.9 | 16.6 | $ 17.2 | $ 18.6
Expected period related to remediation expenditures for environmental contingencies | 30 years |  |  |
Estimated environmental contingency loss exposure in excess of current accrual | $ 11.6 |  |  |
Time period within which Company's recorded estimate of its obligation may change | 12 months |  |  |
Gain Contingency, Unrecorded Amount | $ 2.4 |  |  |
Capital lease obligations | 7.0 |  |  |
Capital lease asset | 8.3 | 2.2 |  |
Capital lease accumulated depreciation | (1.3) | $ (0.9) |  |
Other Accrued Liabilities |  |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |
Capital lease obligations | 1.4 |  |  |
Longterm Liabilities |  |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |
Capital lease obligations | $ 5.6 |  |  |

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