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INVESTMENT IN UNCONSOLIDATED AFFILIATES (Details) - USD ($) $ in Millions				3 Months Ended	12 Months Ended
	Dec. 31, 2020	Apr. 01, 2019	Mar. 19, 2019	Jan. 02, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2017
Investments in and Advances to Affiliates [Line Items]
Loans receivable, carrying value	$ 66.4				$ 35.8	$ 100.0
Gain from change in fair value of loans receivable				$ 12.5
Loans receivable, fair value				$ 78.9
Investment, estimated fair value	$ 23.3
Investment in unconsolidated affiliates					207.0	0.0
Equity in income of unconsolidated affiliates					14.4	0.0	$ 3.3
Proceeds from sale of investment in unconsolidated affiliates						0.0	274.3
Distributions intended to cover required tax payments					(538.6)	$ 46.9	255.2
Bonnie Plants, LLC
Investments in and Advances to Affiliates [Line Items]
Percent ownership	50.00%
Payments to acquire equity interest	$ 102.3
Investment in unconsolidated affiliates	$ 202.9
Distributions from equity method investment					$ 12.0
TruGreen Joint Venture
Investments in and Advances to Affiliates [Line Items]
Percent ownership sold			30.00%
U.S. Consumer | Industrial Turf and Ornamental Market Investment
Investments in and Advances to Affiliates [Line Items]
Proceeds from sale of investment in unconsolidated affiliates		$ 36.6
Gain on sale of investments							2.9
Investments in and advance to affiliates, subsidiaries, associates, and joint ventures								$ 29.4
Distribution of earnings from unconsolidated affiliate							4.9
Outdoor Home Services Holdings LLC | TruGreen Joint Venture
Investments in and Advances to Affiliates [Line Items]
Proceeds from sale of investment in unconsolidated affiliates			$ 234.2
Proceeds collection of second lien term loan financing			$ 18.4
Distributions intended to cover required tax payments							3.5
Gain on sale of investments							259.8
Tax payments due to sale of equity interest							$ 99.5

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