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GUARANTEES (Details) $ in Millions	Mar. 31, 2020 USD ($)
Guarantees
Total guarantees	$ 149.1
Guarantees expiring in less than 1 year	21.2
Guarantees expiring within 1 to 3 years	0.4
Guarantees with expiration over 3 years	127.5
Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	31.6
Guarantees expiring in less than 1 year	9.2
Guarantees expiring within 1 to 3 years	0.2
Guarantees with expiration over 3 years	22.2
Standby letters of credit
Guarantees
Total guarantees	95.5
Guarantees expiring in less than 1 year	1.2
Guarantees expiring within 1 to 3 years	0.2
Guarantees with expiration over 3 years	94.1
Surety bonds
Guarantees
Total guarantees	9.9
Guarantees expiring in less than 1 year	9.9
Guarantees expiring within 1 to 3 years	0.0
Guarantees with expiration over 3 years	0.0
Other guarantees
Guarantees
Total guarantees	12.1
Guarantees expiring in less than 1 year	0.9
Guarantees expiring within 1 to 3 years	0.0
Guarantees with expiration over 3 years	11.2
Other indemnifications
Guarantees
Total guarantees	12.1
Liability related to workers compensation coverage	11.2
UMERC | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	4.2
Bluewater | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	6.2
WECI | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	$ 21.2

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

+ Details

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X

- Definition

Represents the maximum potential payments with respect to the entity's guarantees that expire in less than a year.

+ References

No definition available.

+ Details

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X

- Definition

Represents the maximum potential payments with respect to the entity's guarantees that expire after three years.

+ References

No definition available.

+ Details

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- Definition

Represents the maximum potential payments with respect to the entity's guarantees that expire within one to three years.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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