Debt - Components of Convertible Debt (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Interest Expense, Debt [Abstract]
Amortization of debt discount	$ 7.7	$ 3.9	$ 23.0	$ 3.9
Amortization of debt issuance costs	0.8	0.4	2.5	0.4
Less: Interest capitalized	(0.1)	0.0	(0.3)	0.0
Total interest expense related to the Notes	8.5	$ 4.3	25.2	$ 4.3
Convertible Notes Maturing February 15, 2026 \| Convertible Debt
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [Abstract]
Principal	1,000.0		1,000.0
Unamortized debt discount	(129.3)		(129.3)
Unamortized debt issuance costs	(15.4)		(15.4)
Net carrying amount	$ 855.3		$ 855.3

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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