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Commitments and Contingencies, Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |
Rental expense | $ 8.2 | $ 7.4 | $ 7.5 |
Amounts to be purchased under the variable priced metal contracts | 140.6 |  |  |
Environmental accrual | $ 18.6 | $ 19.3 | $ 22.8 | $ 21.7
Expected period related to remediation expenditures for environmental contingencies | 30 years |  |  |
Estimated environmental contingency loss exposure in excess of current accrual | $ 24.7 |  |  |
Time period within which Company's recorded estimate of its obligation may change | 12 months |  |  |
Minimum |  |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |
Period for feasibility study completion | 12 months |  |  |
Maximum |  |  |  |
Accrual for Environmental Loss Contingencies, Gross, Fiscal Year Maturity |  |  |  |
Period for feasibility study completion | 18 months |  |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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