Shareholder's Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions				3 Months Ended			6 Months Ended
	Feb. 24, 2020	Nov. 18, 2019	Jul. 24, 2018	Mar. 29, 2020	Mar. 31, 2019	Dec. 31, 2018	Mar. 29, 2020	Mar. 31, 2019
Common stock repurchase program, approved amount			$ 1,000.0
Common stock repurchase program, authorization period			36 months
Shares repurchased				3.0	4.6		6.2	4.9
Repuchase amount, fair value				$ 167.7	$ 250.0	$ 18.5	$ 364.5	$ 268.5
Average cost per share				$ 55.06	$ 54.22		$ 58.57	$ 54.34
ASR [Member]
Repuchase payment		$ 125.0
Shares repurchased	0.3	1.7		0.3			2.0
Percentage of total shares		85.00%
Repuchase amount, fair value	$ 18.5	$ 106.3		$ 18.5			$ 124.7
Average cost per share				$ 59.69			$ 61.47
Reduction to additional paid-in capital		$ 18.7
ASR [Member] | Weighted Average [Member]
Shares repurchased							2.0
Average cost per share							$ 61.59