Fair Value of Assets and Liabilities (FV on nonrecurring basis) (Details 4) $ in Millions	Dec. 31, 2019 USD ($)
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
valuation allowance equipment held for sale	$ 0.2

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.

No definition available.

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration