Acquisitions and Divestitures Definite-lived intangible assets acquired (Details) - USD ($) $ in Millions	Dec. 29, 2019	Sep. 29, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,191.3	$ 1,181.4
Finite-Lived Intangible Assets, Accumulated Amortization	658.7	603.0
Finite-Lived Intangible Assets, Net	532.6	578.4
Acquired and reacquired rights
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,084.3	1,075.0
Finite-Lived Intangible Assets, Accumulated Amortization	589.7	537.2
Finite-Lived Intangible Assets, Net	$ 494.6	$ 537.8