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Benefit Plans - Percentage of Fair Value of Pension Plan Assets (Details) - Pension Plans	Dec. 31, 2018	Dec. 31, 2017
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	100.00%	100.00%
U.S. Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	15.00%	15.00%
U.S. Plans | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	85.00%	85.00%
U.S. Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	0.00%	0.00%
U.S. Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	0.00%	0.00%
U.S. Plans | Private equity
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	0.00%	0.00%
U.S. Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	0.00%	0.00%
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	100.00%	100.00%
Non-U.S. Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	26.00%	28.00%
Non-U.S. Plans | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	65.00%	60.00%
Non-U.S. Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	6.00%	6.00%
Non-U.S. Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	2.00%	4.00%
Non-U.S. Plans | Private equity
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	0.00%	1.00%
Non-U.S. Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Percentage of fair value pension plan assets	1.00%	1.00%

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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

Percentage of actual 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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