Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Apr. 02, 2022	Jan. 01, 2022	Oct. 02, 2021	Apr. 03, 2021	Dec. 26, 2020	Sep. 26, 2020	Apr. 02, 2022	Apr. 03, 2021
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	$ 2,021.9	$ 1,971.4	$ 1,972.8	$ 1,921.9	$ 1,816.1	$ 1,749.2	$ 1,972.8	$ 1,749.2
Other comprehensive loss	(7.4)	(2.3)	0.3	(0.3)	(0.4)	(1.5)	(9.4)	(2.2)
Balance at the end of the period	1,912.1	2,021.9	1,971.4	2,165.0	1,921.9	1,816.1	1,912.1	2,165.0
Total
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	6.2	8.5	8.2	6.0	6.4	7.9	8.2	7.9
Other comprehensive loss	(7.4)	(2.3)	0.3	(0.3)	(0.4)	(1.5)
Balance at the end of the period	(1.2)	6.2	8.5	5.7	6.0	6.4	(1.2)	5.7
Foreign Currency Translation Adjustments, Net of Tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7
Other comprehensive loss	0.0	0.0	0.0	0.0	0.0	0.0
Balance at the end of the period	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7
Defined Benefit Obligations, Net of Tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(1.4)	(1.4)	(1.4)	(4.2)	(4.2)	(4.2)	(1.4)	(4.2)
Other comprehensive loss	(0.5)	0.0	0.0	0.0	0.0	0.0
Balance at the end of the period	(1.9)	(1.4)	(1.4)	(4.2)	(4.2)	(4.2)	(1.9)	(4.2)
Unrealized gain (loss) on available-for-sale securities, net of tax
Changes in accumulated other comprehensive income (loss) by component
Balance at the beginning of the period	(2.1)	0.2	(0.1)	0.5	0.9	2.4	(0.1)	2.4
Other comprehensive loss	(6.9)	(2.3)	0.3	(0.3)	(0.4)	(1.5)
Balance at the end of the period	$ (9.0)	$ (2.1)	$ 0.2	$ 0.2	$ 0.5	$ 0.9	$ (9.0)	$ 0.2