Derivatives - Gain (Loss) on Fair Value Hedges Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedges, gain (loss)	$ (2.1)	$ 0.9	$ (1.9)	$ 6.3
Forward foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Forward foreign currency contracts	(1.3)	0.9	0.0	6.3
Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedges, gain (loss)	$ (0.8)	$ 0.0	$ (1.9)	$ 0.0