Income Taxes (Summary of Activity Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning balance	$ 196.9	$ 146.5	$ 150.4
Increase related to prior year tax positions	17.5	10.4	0.0
Decrease related to prior year tax positions	(41.8)	0.0	(23.6)
Increase related to current year tax positions	62.4	41.3	33.7
Decreases related to settlements with taxing authorities	(4.5)	0.0	(3.1)
Decreases related to lapsing of statute of limitations	(5.9)	(1.3)	(10.9)
Ending balance	224.6	$ 196.9	$ 146.5
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Amount of reasonably possible unrecognized benefit change	79.0
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Amount of reasonably possible unrecognized benefit change	$ 117.0

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of unrecognized tax benefits.

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