Equity (Impact of Reclassifications from Accumulated Other Comprehensive Income on Earnings) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 29, 2020	Mar. 31, 2019	Mar. 29, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	$ 2.0	$ 15.2	$ 18.0	$ 39.9
Revenues	5,995.7	6,305.9	13,092.8	12,938.7
Amounts Reclassified from AOCI, Interest expense	(99.2)	(73.9)	(191.1)	(148.9)
Amounts Reclassified from AOCI, Cost of sales including occupancy costs	(1,997.7)	(2,012.0)	(4,234.2)	(4,187.8)
Gain (Loss) on Disposition of Business	0.0	21.0	0.0	21.0
Amounts Reclassified from AOCI, Tax (expense)/benefit	(65.4)	(161.2)	(324.0)	(366.4)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Total before tax	6.4	5.8	17.1	(2.3)
Amounts Reclassified from AOCI, Tax (expense)/benefit	(1.6)	(1.6)	(3.9)	(0.9)
Amounts Reclassified from AOCI, Net of tax	4.8	4.2	13.2	(3.2)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	(0.1)	0.1	0.0	0.4
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	0.2	0.2	0.0	0.7
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	(1.8)	(4.3)	(7.9)	2.8
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Total before tax	(2.3)	(5.6)	(9.9)	3.0
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	(2.9)	0.0	(5.3)	0.0
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	3.9	0.0	7.2	0.0
Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	$ 0.0	$ 0.0	$ 0.0	$ 0.0