Goodwill and Intangible Assets (Changes in Goodwill) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill at beginning of the period	$ 2,176.7
Goodwill at end of the period	2,176.7
Completed and transferred in-process research and development	$ 293.5
Weighted average amortization period (years)	12 years