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Postretirement Benefits Postretirement Benefits - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |  |  |
Health Care Cost Trend Rate for Next Year |  | 5.60% | 5.70% |  |
Rate to Which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate) |  | 4.50% | 4.50% |  |
Year Rate Reaches the Ultimate Trend Rate |  | 2037 | 2037 |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |  |  |
Total |  | 100.00% | 100.00% |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Total |  | 100.00% |  |  |
Pension Plans [Member] |  |  |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used to Determine Pension and Other Postretirement Benefit Obligations [Abstract] |  |  |  |  |
Discount Rate |  | 3.63% | 4.00% |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |
Discount Rate | [1] | 3.40% | 3.58% | [2] | 3.95%
Long-Term Rate of Return on Plan Assets | [3] | 4.75% | 5.25% | [2] | 6.00%
Other Postretirement Benefit Plans [Member] |  |  |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used to Determine Pension and Other Postretirement Benefit Obligations [Abstract] |  |  |  |  |
Discount Rate |  | 3.51% | 3.93% |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |  |  |
Discount Rate | [1] | 3.17% | 3.30% | [2] | 3.75%
Equity Securities [Member] | United States [Member] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |  |  |
Total |  | 4.00% | 19.00% |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Total |  | 4.00% |  |  |
Equity Securities [Member] | International [Member] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |  |  |
Total |  | 1.00% | 3.00% |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Total |  | 1.00% |  |  |
Fixed Income Securities [Member] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |  |  |
Total |  | 89.00% | 75.00% |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Total |  | 95.00% |  |  |
Short-Term Investments [Member] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |  |  |
Total |  | 6.00% | 3.00% |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |  |  |
Total |  | 0.00% |  |  |
[1] | (A) The Company utilizes a yield curve analysis to calculate the discount rates used to determine pension and other postretirement benefit obligations. The yield curve analysis matches the cash flows of the Company's benefit obligations. The yield curve consisted of spot interest rates at half year increments for each of the next 30 years and was developed based on pricing and yield information for high quality corporate bonds rated Aa by either Moody's or Standard & Poor's, private placement bonds that are traded in reliance with Rule 144A and are at least two years from date of issuance, bonds with make-whole provisions and bonds issued by foreign corporations that are denominated in U.S. dollars, excluding callable bonds and bonds less than a minimum size and other filtering criteria. Additionally, the Company's yield curve methodology includes bonds having a yield that is greater than the regression mean yield curve as the Company believes this methodology represents an appropriate estimate of the rates at which the Company could effectively settle its pension obligations.
[2] | (C) The Company evaluates its assumption regarding the estimated long-term rate of return on plan assets based on historical experience, future expectations of investment returns, asset allocations, investment strategies and views of investment professionals.
[3] | (B) Pension expense in 2017 and 2016 includes the impact of a change in methodology used to calculate the interest cost component of pension expense. In 2015 and prior years, the Company used a single-weighted average discount rate to calculate pension and postretirement interest costs. Beginning in 2016, the Company is utilizing a "spot rate approach" in the calculation of pension and postretirement interest costs to provide a more accurate measurement of interest costs. The spot rate approach applies separate discount rates for each projected benefit payment in the calculation of pension and postretirement interest costs. This calculation change is considered to be a change in accounting estimate and is being applied prospectively starting in 2016.

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- Definition Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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