Amount, after effects of reinsurance, of expense for claims incurred and costs incurred in the claim settlement process attributable to asbestos and environmental claims.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437

Name:	us-gaap_LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments and Contingencies (Narrative) (Details)	3 Months Ended		6 Months Ended
Commitments and Contingencies (Narrative) (Details)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 RUB (₽)
Product Liability Contingency [Line Items]
Expense for asbestos-related litigation	$ (200,000)	$ 700,000	$ 1,900,000	$ 2,400,000
Unfavorable Regulatory Action [Member]
Product Liability Contingency [Line Items]
Alleged unauthorized payment					$ 475	₽ 30,000