Debt and Financing Arrangements - Components of Convertible Debt (Details) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Interest Expense, Debt [Abstract]
Amortization of debt discount	$ 3.9	$ 3.9
Amortization of debt issuance costs	0.4	0.4
Total interest expense related to the Notes	4.3	4.3
0% Convertible Senior Notes Due 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	(159.9)	(159.9)
Unamortized debt issuance costs	(18.6)	(18.6)
Net carrying amount	821.5	821.5
Debt Instrument, Equity Issuance Cost, Net [Abstract]
Proceeds allocated to the conversion option (debt discount)	163.8	163.8
Issuance costs	(3.7)	(3.7)
Net carrying amount	$ 160.1	$ 160.1

Debt Instrument, Convertible, Carrying Amount Of Equity Component, Gross

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Debt Issuance Costs, Gross, Equity Component

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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, 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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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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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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