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Commitments and Contingencies Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future minimum rental payments | Minimum rental commitments under operating leases at December 31, 2016 were as follows (in millions of dollars):
|  | Year Ended December 31,
|  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 and Thereafter
Minimum rental commitments |  | $ | 6.1 |  |  | $ | 5.4 |  |  | $ | 5.1 |  |  | $ | 2.8 |  |  | $ | 2.4 |  |  | $ | 23.1 |
Schedule of changes in environmental contingencies |
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Beginning balance |  | $ | 18.6 |  |  | $ | 19.3 |  |  | $ | 22.8 |
Additional accruals |  | 0.1 |  |  | 1.3 |  |  | 0.8 |
Less expenditures |  | (1.5 | ) |  | (2.0 | ) |  | (4.3 | )
Ending balance |  | $ | 17.2 |  |  | $ | 18.6 |  |  | $ | 19.3 |
Summary of activities relating to the Company's CARO liabilities | The following table summarizes the activity relating to our CARO liabilities (in millions of dollars):
|  | Year Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Beginning balance |  | $ | 4.9 |  |  | $ | 4.8 |  |  | $ | 4.4 |
Liabilities incurred during the period |  | — |  |  | — |  |  | — |
Liabilities settled during the period |  | (0.1 | ) |  | (0.2 | ) |  | — |
Accretion expense |  | 0.5 |  |  | 0.3 |  |  | 0.4 |
Adjustment to accretion expense due to revisions to estimated cash flow and timing of expenditure 1 |  | 0.2 |  |  | — |  |  | — |
Ending balance |  | $ | 5.5 |  |  | $ | 4.9 |  |  | $ | 4.8 |
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1. | The adjustments in 2016 did not have a material impact on the basic and diluted net income per share for 2016.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + 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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