Acquisitions and Divestitures Definite-lived intangible assets acquired (Details) - USD ($) $ in Millions	Mar. 29, 2020	Sep. 29, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,183.9	$ 1,181.4
Finite-Lived Intangible Assets, Accumulated Amortization	709.4	603.0
Finite-Lived Intangible Assets, Net	474.5	578.4
Acquired and reacquired rights
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,076.9	1,075.0
Finite-Lived Intangible Assets, Accumulated Amortization	637.2	537.2
Finite-Lived Intangible Assets, Net	$ 439.7	$ 537.8