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LONG-TERM DEBT (Details) - Subsequent event $ in Millions	Apr. 29, 2020 USD ($)
MERC | MERC Senior Notes 2.69% due May 1, 2025
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 50.0
Debt instrument stated interest rate percentage	2.69%
MGU | MGU Senior Notes 2.69% due May 1, 2025
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 60.0
Debt instrument stated interest rate percentage	2.69%

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ References

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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