Acquisitions and Divestitures Definite-lived intangible assets acquired (Details) - USD ($) $ in Millions	Jun. 28, 2020	Sep. 29, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,274.2	$ 1,181.4
Finite-Lived Intangible Assets, Accumulated Amortization	771.2	603.0
Finite-Lived Intangible Assets, Net	503.0	578.4
Acquired and reacquired rights
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,083.4	1,075.0
Finite-Lived Intangible Assets, Accumulated Amortization	693.5	537.2
Finite-Lived Intangible Assets, Net	$ 389.9	$ 537.8