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EQUITY - Share Repurchases (Details) - USD ($) shares in Millions	1 Months Ended	12 Months Ended			68 Months Ended
	Aug. 31, 2014	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Mar. 28, 2020	Feb. 06, 2020	Aug. 03, 2016
Accelerated Share Repurchases [Line Items]
Number of common shares repurchased (in shares)		0.6
Value of common shares repurchased to be held in treasury		$ 113,100,000
Tax withholding		$ 16,300,000	$ 4,900,000	$ 2,700,000
August 11, 2014 Program
Accelerated Share Repurchases [Line Items]
Stock repurchase authorization	$ 500,000,000.0						$ 1,000,000,000
Share repurchase period (in years)	5 years
Additional shares authorized repurchase							$ 500,000,000.0
Number of common shares repurchased (in shares)		0.4		0.0	8.7
Value of common shares repurchased to be held in treasury		$ 48,200,000			$ 762,800,000
February 6, 2020 Program
Accelerated Share Repurchases [Line Items]
Stock repurchase authorization						$ 750,000,000.0
Number of common shares repurchased (in shares)			0.0

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Additional amount of common shares authorized to be repurchased through authorized repurchase program.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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