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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
After-tax gain from the sale assets	$ 9.8	$ 7.7	$ 8.9	$ 4.2	$ 5.5	$ 3.1	$ 3.8	$ 4.2
After-tax gain from the sale assets per diluted share (in dollars per share)	$ 0.09	$ 0.07	$ 0.08	$ 0.04	$ 0.05	$ 0.02	$ 0.04	$ 0.04
After-tax loss from asset impairments		$ 173.2			$ 17.2
After-tax loss from asset impairments per dilutive share (in dollars per share)		$ 1.58			$ 0.16
Tax benefit								$ 502.1
Tax benefit per diluted share (in dollars per share)								$ 4.59

X

- Definition

Amount of write-down of assets, net of tax recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

No definition available.

+ Details

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X

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period related to the Tax Cuts and Jobs Act of 2017.

+ References

No definition available.

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X

- Definition

Represents the gain from the sale of assets, net of tax.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The increase (decrease) in diluted earnings per share as a result of the gain from the sale of assets.

+ References

No definition available.

+ Details

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X

- Definition

The amount of asset impairment charge per diluted share during the reporting period.

+ References

No definition available.

+ Details

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X

- References

No definition available.

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X

- Definition

Amount of reasonable estimate for income tax expense (benefit) for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2A
-Subparagraph (SAB Topic 5.EE.Q2(b))
-URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817

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