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Long-term Debt - Liability and Equity Component of Convertible Notes (Details) - Convertible Notes - USD ($) $ in Millions	Dec. 27, 2020	Jun. 28, 2020
Liability Component:
Principal	$ 999.8	$ 999.8
Unamortized discount and issuance costs	(196.3)	(216.0)
Net carrying amount	803.5	783.8
Equity Component:
Discount related to value of conversion option	262.3	262.3
Partial extinguishment of 2023 Notes	(27.7)	(27.7)
Debt issuance costs	(6.3)	(6.3)
Net carrying amount	$ 228.3	$ 228.3

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Debt Extinguishment

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Debt Instrument, Unamortized Discount Of Conversion Option

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Equity Component [Abstract]

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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 of unamortized debt discount (premium) and debt issuance costs.

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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, 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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