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Employee Retirement Plans - Summary of Plans' Weighted-Average Asset Targets and Actual Allocations as Percentage of Plan Assets (Details)	12 Months Ended
	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	100.00%
Actual Allocations (as a percent)	100.00%
Liability hedging
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	24.70%
Actual Allocations (as a percent)	25.50%
Equities
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	27.70%
Actual Allocations (as a percent)	32.10%
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	27.70%
Actual Allocations (as a percent)	32.10%
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	15.00%
Actual Allocations (as a percent)	9.30%
Property
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	4.90%
Actual Allocations (as a percent)	1.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocations (as a percent)	0.00%
Actual Allocations (as a percent)	0.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ 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)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&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)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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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=58740216&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=58740216&loc=d3e1928-114920

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