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Debt - Schedule of Long-term Debt Instruments (Details) € in Millions, $ in Millions	Mar. 31, 2026 USD ($)	Jun. 30, 2025	Mar. 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,567.2
Unamortized debt issuance costs	(32.2)		$ (4.5)
Total debt	4,535.0		1,119.5
Less current portion	(43.8)		(9.4)
Total Long-term debt	$ 4,491.2		$ 1,110.1
Weighted average interest rate of total debt	5.50%		4.80%	4.80%
Senior Unsecured Notes \| Senior Notes \| Level 1
Debt Instrument [Line Items]
Fair value of senior notes	$ 395.0		$ 817.7
5.000% Senior notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Interest rate (as percent)	5.00%
Long-term debt, gross	$ 400.0		400.0
3.625% Senior notes due 2026 \| Senior Notes
Debt Instrument [Line Items]
Interest rate (as percent)	3.625%
Long-term debt, gross	$ 0.0		433.4	€ 400.0
Term Loan due 2028
Debt Instrument [Line Items]
Long-term debt, gross	0.0		290.6
Senior Secured Notes \| Senior Notes \| Level 1
Debt Instrument [Line Items]
Fair value of senior notes	$ 1,685.5		0.0
5.875% Senior notes due 2031 \| Senior Notes
Debt Instrument [Line Items]
Interest rate (as percent)	5.875%	5.875%
Long-term debt, gross	$ 700.0		0.0
6.125% Senior notes due 2032 \| Senior Notes
Debt Instrument [Line Items]
Interest rate (as percent)	6.125%	6.125%
Long-term debt, gross	$ 1,000.0		0.0
Credit Facilities \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	2,467.2
Credit Facilities \| Line of Credit \| Revolving Facility
Debt Instrument [Line Items]
Long-term debt, gross	0.0		0.0
Credit Facilities \| Line of Credit \| Term A-1 Facility, due 2028
Debt Instrument [Line Items]
Long-term debt, gross	750.0		0.0
Credit Facilities \| Line of Credit \| Term A-2 Facility, due 2030
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,717.2		$ 0.0