Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Jan. 01, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 399.9	$ 509.3
Other comprehensive income, net of tax
Fair value of investments	(0.1)	(0.2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	3.3	0.3
Comprehensive income	$ 403.1	$ 509.4