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SHAREHOLDER’S EQUITY - Summary of Activity of Common Stock Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions			12 Months Ended		15 Months Ended
	Feb. 24, 2020	Nov. 18, 2019	Sep. 30, 2021	Sep. 30, 2020	Feb. 24, 2020
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			1,600	6,200
Average price per share (in dollars per share)			$ 81.43	$ 58.57
Total repurchase amount				$ 239.8
Accelerated share repurchase final settlement				125.0
Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 125.8	239.8
Accelerated share repurchase final settlement				124.8
Treasury stock and accelerated share repurchase amount				$ 364.6
Open Market Purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			900	4,100
Average price per share (in dollars per share)			$ 93.13	$ 56.97
Open Market Purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 80.3	$ 230.6
Private Purchases
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)			700	100
Average price per share (in dollars per share)			$ 66.63	$ 62.30
Private Purchases | Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 45.5	$ 9.2
ASR
Accelerated Share Repurchases [Line Items]
Number of shares repurchased (in shares)	300	1,700	0	2,000	2,000
Average price per share (in dollars per share)			$ 0	$ 61.47	$ 61.59
Total repurchase amount	$ 18.5	$ 106.3
ASR | Treasury Stock
Accelerated Share Repurchases [Line Items]
Total repurchase amount			$ 0.0
Accelerated share repurchase final settlement				$ 124.8

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