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Commitments and Contingencies, Textuals (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum
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Commitments and contingencies |  |  |
Period for Ohio Environmental Protection Agency feasibility study completion |  | 18 months | 24 months
Environmental accrual | $ 22.5 |  |
Expected period the Company expects remedictations actions will be taken | 30 years |  |
Potential increase in environmental costs | $ 24.9 |  |

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