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Commitments and Contingencies - Asbestos Narrative (Details) $ in Millions	12 Months Ended	324 Months Ended
	Dec. 31, 2017 claimants cases	Dec. 31, 2017 USD ($) claimants cases
Maximum [Member]
Loss Contingencies [Line Items]
Estimated time until primary insurance is exhausted	12 months
Asbestos [Member]
Loss Contingencies [Line Items]
Total settlement costs | $		$ 8.5
Percentage of settlement and defense costs covered by insurance		40.00%
Asbestos [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Number of pending cases | cases	605	605
Number of pending claims	5,256
Number of pending claims seeking specific amounts of damages	49	49

X

- Definition

Estimated Time until Primary Insurance is Exhausted

+ References

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- Definition

Loss Contingency, Number of Plaintiffs Specifying Damages Sought

+ References

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X

- Definition

Percentage of Settlement and Defense Costs Covered by Insurance

+ References

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- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

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- Definition

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- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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