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Debt (Tables)
 3 Months Ended
Oct. 03, 2020
Debt Disclosure [Abstract]  
Schedule of Carrying Amounts of the Liability and Equity Components of Convertible Debt
The following table presents the carrying amounts of the liability and equity components of our debt (in millions):
 
October 3, 2020
 
June 27, 2020
Principal amount of 1.00% Senior Convertible Notes
$
460.0

 
$
460.0

Principal amount of 1.75% Senior Convertible Notes
225.0

 
225.0

Unamortized discount of liability component
(73.7
)
 
(79.1
)
Unamortized debt issuance cost
(4.7
)
 
(5.0
)
Carrying amount of liability component
$
606.6

 
$
600.9

 
 
 
 
Carrying amount of equity component (1)
$
136.8

 
$
136.8


(1) 
Included in additional paid-in-capital on the Consolidated Balance Sheets.
Summary of Effective Interest Rate and the Interest Expense for the Contractual Interest and the Accretion of Debt Discount
The following table presents the interest expense for contractual interest, amortization of debt issuance costs and accretion of debt discount (in millions):
 
Three Months Ended
 
October 3, 2020
 
September 28, 2019
Interest expense-contractual interest
$
2.1

 
$
2.1

Amortization of debt issuance cost
0.5

 
0.3

Accretion of debt discount
5.4

 
5.1