Employees, Retirement and Incentive Plans Performance Units (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement Instruments [Roll Forward]
Weighted Average Fair Value of Units Outstanding	$ 1.2
Performance Shares [Member]
Share-based Compensation Arrangements
Estimated Share Payouts Unit Awards Minimum	100.00%
Estimated Share Payouts Unit Awards Maximum	150.00%
Share-based Compensation Arrangement Instruments [Roll Forward]
Outstanding at January 1, 2020 (nonvested)	53,445
Vesting and transfer of common units to recipients	(11,634)
Outstanding at March 31, 2020 (nonvested)	41,811
Fair value of vested units transferred to recipients	$ 0.4	$ 0.3
Total unrecognized compensation related to nonvested units	$ 0.5
Weighted average remaining contractual term (years)	1 year 9 months 18 days
Restricted and Phantom Units
Share-based Compensation Arrangement Instruments [Roll Forward]
Outstanding at January 1, 2020 (nonvested)	145,205
Vesting and transfer of common units to recipients	(4,397)
Forfeitures	(3,267)
Outstanding at March 31, 2020 (nonvested)	137,541
Total unrecognized compensation related to nonvested units	$ 1.9
Weighted average remaining contractual term (years)	1 year 4 months 24 days

Estimated Share Payouts, Outstanding Nonvested Performance Unit Awards Maximum

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Estimated Share Payouts, Outstanding Nonvested Performance Unit Awards Minimum

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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