PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Additional) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, employer contribution, maximum percentage	7.00%	6.00%
Defined contribution plan, expense relating to the plan	$ 5.4	$ 4.2
Contributions made by the corporation to the plan	$ 10.9
Scenario, Forecast [Member]
Defined Contribution Plan Disclosure [Line Items]
Estimated future contributions for the current fiscal year			$ 15.1

Defined Contribution Plan, Employer Contribution, Percentage, Maximum

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- Definition

Defined Contribution Plan, Estimated Future Employer Contributions in Current Fiscal Year

+ References

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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- 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.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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