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Commitments and Contingencies Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future minimum rental payments | Minimum rental commitments under operating leases at December 31, 2015 were as follows (in millions of dollars):
|  | Year Ended December 31,
|  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 and Thereafter
Minimum rental commitments |  | $ | 6.2 |  |  | $ | 5.1 |  |  | $ | 4.1 |  |  | $ | 3.9 |  |  | $ | 2.2 |  |  | $ | 25.8 |
Schedule of future purchase obligations | mounts due under purchase obligations as of December 31, 2015 were as follows (in millions of dollars):
|  | Year Ended December 31,
|  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 and Thereafter
Raw materials |  | $ | 179.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Energy |  | 10.3 |  |  | 9.5 |  |  | 5.6 |  |  | 0.6 |  |  | 0.6 |  |  | 1.5 |
Capital equipment |  | 5.2 |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Total purchase obligations |  | $ | 194.8 |  |  | $ | 9.6 |  |  | $ | 5.6 |  |  | $ | 0.6 |  |  | $ | 0.6 |  |  | $ | 1.5 |
Schedule of changes in environmental contingencies | The following table presents the changes in such accruals, which are primarily included in Long-term liabilities (in millions of dollars):
|  | Year Ended December 31,
|  | 2015 |  | 2014 |  | 2013
Beginning balance |  | $ | 19.3 |  |  | $ | 22.8 |  |  | $ | 21.7 |
Additional accruals |  | 1.3 |  |  | 0.8 |  |  | 4.5 |
Less expenditures |  | (2.0 | ) |  | (4.3 | ) |  | (3.4 | )
Ending balance |  | $ | 18.6 |  |  | $ | 19.3 |  |  | $ | 22.8 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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