Environmental	9 Months Ended
Sep. 30, 2017
Environmental Expense and Liabilities [Abstract]
Environmental	Environmental Environmental costs are charged to operating expenses if they relate to an existing condition caused by past operations and do not contribute to current or future revenue generation. We have ongoing investigations of environmental matters at various locations and routinely assess our recorded environmental obligations, if any, with respect to such matters. Liabilities are recorded when site restoration and environmental remediation, cleanup and other obligations are either known or considered probable and can be reasonably estimated. Such estimates are undiscounted and require judgment with respect to costs, time frame and extent of required remedial and cleanup activities and are subject to periodic adjustments based on currently available information. Recoveries of environmental costs through insurance, indemnification arrangements or other sources are included in other assets to the extent such recoveries are considered probable. We incurred expense of $0.1 million for the three months ended September 30, 2017, and reduced expense by $0.8 million for the nine months ended September 30, 2017 for environmental remediation obligations. For the three and the nine months ended September 30, 2016, we incurred expense of $0.6 million and $2.0 million, respectively, for environmental remediation obligations. The accrued environmental liability reflected in our consolidated balance sheets was $93.6 million and $96.4 million at September 30, 2017 and December 31, 2016, respectively, of which $80.4 million and $82.9 million, respectively, were classified as other long-term liabilities. These accruals include remediation and monitoring costs expected to be incurred over an extended period of time (up to 30 years for certain projects). The amount of our accrued liability includes PCLI environmental obligations of $3.6 million assumed upon our February 1, 2017 acquisition. Estimated liabilities could increase in the future when the results of ongoing investigations become known, are considered probable and can be reasonably estimated.

Environmental

Environmental costs are charged to operating expenses if they relate to an existing condition caused by past operations and do not contribute to current or future revenue generation. We have ongoing investigations of environmental matters at various locations and routinely assess our recorded environmental obligations, if any, with respect to such matters. Liabilities are recorded when site restoration and environmental remediation, cleanup and other obligations are either known or considered probable and can be reasonably estimated. Such estimates are undiscounted and require judgment with respect to costs, time frame and extent of required remedial and cleanup activities and are subject to periodic adjustments based on currently available information. Recoveries of environmental costs through insurance, indemnification arrangements or other sources are included in other assets to the extent such recoveries are considered probable.

We incurred expense of $0.1 million for the three months ended September 30, 2017, and reduced expense by $0.8 million for the nine months ended September 30, 2017 for environmental remediation obligations. For the three and the nine months ended September 30, 2016, we incurred expense of $0.6 million and $2.0 million, respectively, for environmental remediation obligations. The accrued environmental liability reflected in our consolidated balance sheets was $93.6 million and $96.4 million at September 30, 2017 and December 31, 2016, respectively, of which $80.4 million and $82.9 million, respectively, were classified as other long-term liabilities. These accruals include remediation and monitoring costs expected to be incurred over an extended period of time (up to 30 years for certain projects). The amount of our accrued liability includes PCLI environmental obligations of $3.6 million assumed upon our February 1, 2017 acquisition. Estimated liabilities could increase in the future when the results of ongoing investigations become known, are considered probable and can be reasonably estimated.