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Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales		$ 4,690.0	$ 4,137.5	$ 13,637.4	$ 12,048.5
Cost of goods sold		3,701.1	3,270.4	10,967.1	9,618.5
Retained earnings		1,805.1		1,805.1		$ 1,573.3
Income tax (expense) benefit		$ (77.6)	$ (84.5)	$ (187.5)	$ 969.9
Revenue performance obligation, practical expedient				true
Revenue, performance obligation satisfied at point in time				one year or less
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Capitalized contract cost, amortization period		1 year		1 year
Impact of Adoption Increase/(Decrease) [Member] \| ASC 606 [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 183.7	$ (0.1)		$ (2.8)
Cost of goods sold	133.4	(1.0)		(5.1)
Retained earnings	43.5	45.2		45.2
Income tax (expense) benefit	$ (6.8)	$ (0.3)		$ (0.6)