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DEBT - Narrative (Details) € in Millions, $ in Millions, $ in Millions									1 Months Ended	3 Months Ended			6 Months Ended		9 Months Ended
	Aug. 12, 2025	Jul. 11, 2025 USD ($)	Jan. 24, 2025 USD ($)	Jul. 11, 2024	Jul. 10, 2023 USD ($)	Feb. 28, 2023 USD ($)	Nov. 30, 2021 USD ($)	Mar. 05, 2021 USD ($)	Aug. 14, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Nov. 29, 2021	Jun. 30, 2025 EUR (€)	Jan. 25, 2025 USD ($)	Jan. 25, 2025 EUR (€)	Jan. 24, 2025 EUR (€)	Dec. 31, 2024 USD ($)	Jul. 18, 2024 USD ($)	Jul. 18, 2024 EUR (€)	Jul. 10, 2023 EUR (€)	Nov. 30, 2021 EUR (€)	Mar. 05, 2021 EUR (€)	Mar. 05, 2021 CAD ($)
Debt Instrument [Line Items]
Writeoff of unamortized debt discount and debt issuance costs										$ 0.0		$ 0.0	$ 10.3	$ 0.0
Unamortized debt discounts										110.9			110.9
Repayment of debt													600.6	816.8
Debt issuance costs										0.0	$ 2.5	1.6	2.5	1.6
Unamortized debt issuance costs										47.8			47.8							$ 53.8
Debt issuance costs on line of credit										7.9			7.9							9.1
Available capacity under factoring program										318.2			318.2			€ 270.0
Accounts receivable under factoring program still outstanding										165.9			165.9							146.6
Administrative and financing costs										$ 2.9		$ 4.1	5.7	7.9
Proceeds from the sale of accounts receivable													717.7	$ 690.9
Credit Agreement
Debt Instrument [Line Items]
Writeoff of unamortized debt discount and debt issuance costs													$ 10.3
Legal fees			$ 0.3
Debt interest rate			0.25%																0.25%
Credit Agreement | Subsequent Event
Debt Instrument [Line Items]
Writeoff of unamortized debt discount and debt issuance costs									$ 1.4
Credit Agreement | USD Term Loan
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)			3.50%
Debt face amount			$ 2,263.4														$ 2,270.0
Debt effective interest rate										7.80%			7.80%			7.80%
Unamortized debt discounts										$ 75.6			$ 75.6
Credit Agreement | USD Term Loan | Minimum | Subsequent Event
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)	2.25%
Credit Agreement | USD Term Loan | Maximum | Subsequent Event
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)	2.50%
Credit Agreement | EUR Term Loan
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)			3.50%
Debt face amount			$ 1,459.3														$ 1,460.9	€ 1,390.0	€ 1,388.5
Debt effective interest rate										5.60%			5.60%			5.60%
Unamortized debt discounts										$ 35.1			$ 35.1
Credit Agreement | EUR Term Loan | Minimum | Subsequent Event
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)	2.75%
Credit Agreement | EUR Term Loan | Maximum | Subsequent Event
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)	3.00%
Credit Agreement | Revolver
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity								$ 350.0		638.3			638.3							638.3
Line of credit, remaining borrowing capacity										$ 75.8			$ 75.8							$ 274.3
Weighted average interest rate on debt (as a percent)										7.80%			7.80%			7.80%				8.10%
Credit Agreement | Revolver | Subsequent Event
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity		$ 750.0
Credit Agreement | Revolver | Minimum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							3.25%
Line of credit, commitment fee (as a percent)													0.25%
Credit Agreement | Revolver | Minimum | Subsequent Event
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)	1.75%	2.25%
Line of credit, commitment fee (as a percent)		0.25%
Credit Agreement | Revolver | Maximum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							3.75%
Line of credit, commitment fee (as a percent)													0.50%
Credit Agreement | Revolver | Maximum | Subsequent Event
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)	2.25%	2.75%
Line of credit, commitment fee (as a percent)		0.375%
Credit Agreement | 2023 USD Term Loan
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)				4.75%	6.25%
Debt face amount					$ 980.0																$ 20.0
Debt effective interest rate																				9.30%
Debt issuance, percent of principal					0.890
Unamortized debt discounts					$ 107.8															$ 66.3
Credit Agreement | 2023 EUR Term Loan
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)				4.75%	6.50%
Debt face amount					$ 550.0																$ 135.0	€ 123.5	€ 500.0
Debt effective interest rate																				7.80%
Debt issuance, percent of principal					0.890
Unamortized debt discounts					$ 60.5															$ 36.7			€ 55.0
Credit Agreement | 2023 Liquidity Term Loan
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)				4.75%		6.25%
Debt face amount						$ 475.0
Debt effective interest rate																				9.30%
Debt issuance, percent of principal						0.890
Unamortized debt discounts						$ 52.3														$ 27.3
Credit Agreement | 2021 USD Term Loan
Debt Instrument [Line Items]
Debt face amount								$ 950.0
Debt effective interest rate																				8.40%
Debt issuance, percent of principal								0.995
Unamortized debt discounts								$ 4.8												$ 2.1
Repayment of debt							$ 111.6
Credit Agreement | 2021 USD Term Loan | Minimum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							3.50%								3.75%
Credit Agreement | 2021 USD Term Loan | Maximum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							3.75%								4.00%
Credit Agreement | 2021 EUR Term Loan
Debt Instrument [Line Items]
Debt face amount							$ 283.5	$ 650.0																€ 250.0	€ 545.0
Debt effective interest rate																				6.80%
Debt issuance, percent of principal								0.995
Unamortized debt discounts								$ 3.3												$ 1.3					€ 2.7
Credit Agreement | 2021 EUR Term Loan | Minimum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							3.25%								3.50%
Credit Agreement | 2021 EUR Term Loan | Maximum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							3.75%								4.00%
Credit Agreement | 2021 CAD Term Loan
Debt Instrument [Line Items]
Debt face amount								$ 100.0																		$ 128.0
Debt effective interest rate										7.00%			7.00%			7.00%				7.90%
Debt issuance, percent of principal								0.995
Unamortized debt discounts								$ 0.5		$ 0.2			$ 0.2							$ 0.2						$ 0.6
Credit Agreement | 2021 CAD Term Loan | Minimum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							4.00%								4.50%
Credit Agreement | 2021 CAD Term Loan | Maximum
Debt Instrument [Line Items]
Debt, spread on variable rate (as a percent)							4.25%								4.75%

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