Contingent Liabilities and Commitments (Details) - Environmental assessment and remediation [Member] - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Site Contingency [Line Items]
Accrued environmental assessment and remediation costs, total	$ 1.1	$ 1.2
Accrued environmental assessment and remediation costs, current	0.1	0.1
Accrued environmental assessment and remediation costs, noncurrent	$ 1.0	$ 1.1

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	instant