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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of cost capitalized for award under share-based payment arrangement.

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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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CAPITAL STOCK - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended			91 Months Ended
	Jan. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options and restricted stock, anti-dilutive (in shares)			4,500,000	5,000,000.0	5,600,000
Common stock share purchase, shares (in shares)					40,000,000		40,000,000	40,000,000
Treasury shares acquired (in shares)			0	0	7,827,333	40,000,000
Common stock share repurchase price (in USD per share)						$ 79.18
Common stock, quarterly dividend (in USD per share)		$ 0.025		$ 0.25
Common stock, dividends, per share (in USD per share)			$ 0.10	$ 1.00	$ 1.00
Shares authorized and available for grant (in shares)			14,100,000			14,100,000
Shares Issued in the period (in shares)			0	0
Shares exercised in the period (in shares)			0	0	(29,000)
Intrinsic value of options exercised					$ 0.1
Stock-settled and cash-settled compensation expensed			$ 40.0	$ 110.0	157.0
Stock-settled and cash-settled compensation capitalized			7.0	28.0	37.0
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards not yet recognized			0.0			$ 0.0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards not yet recognized			14.0			14.0
Stock-settled and cash-settled compensation expensed			39.0	104.0	101.0
Stock-settled and cash-settled compensation capitalized			$ 6.0	$ 24.0	$ 29.0
Awards granted during period (in shares)			1,352,000	1,479,000	608,000
Weighted average grant date fair value per share (in USD per share)			$ 24.60	$ 36.81	$ 45.59
Restricted Stock \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period in which stock options become exercisable	3 years
Total compensation cost related to non-vested awards not yet recognized	$ 22.0
Awards granted during period (in shares)	1,354,349
Weighted average grant date fair value per share (in USD per share)	$ 16.18
Restricted Stock \| Subsequent Event \| ALTM
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share (in USD per share)	$ 48.84
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards not yet recognized			$ 28.0			$ 28.0
Awards granted during period (in shares)			3,462,000	4,831,000	1,973,000
Phantom Units \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards not yet recognized	$ 71.0
Awards granted during period (in shares)	4,360,656
Phantom Units \| Subsequent Event \| ALTM
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation cost related to non-vested awards not yet recognized	$ 3.0
Awards granted during period (in shares)	56,836
In or after 2016 \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period in which stock options become exercisable			3 years
Period in which stock options expires after grant date			10 years