Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($) shares in Millions		3 Months Ended			9 Months Ended
	Oct. 01, 2019	Sep. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Allowance for doubtful accounts			$ 14,900,000		$ 14,900,000		$ 15,200,000
Allowance for certain customer returns, rebates and incentives			$ 6,900,000		$ 6,900,000		8,100,000
Antidilutive share-based compensation awards (in shares)			0.2	1.4	0.2	1.5
Capital expenditures in accounts payable or other current liabilities at period end					$ 18,000,000.0	$ 10,400,000
Outstanding purchase of common stock recorded in accounts payable					1,800,000	$ 0
Operating lease right-of-use assets			$ 338,700,000		$ 338,700,000		$ 342,900,000
Plex Systems | Forecast
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments to acquire businesses, gross		$ 2,220,000,000
Accounting Standards Update 2016-02
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating lease right-of-use assets	$ 316,000,000
Operating lease liability	329,000,000
Accumulated other comprehensive loss
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reclassification from AOCI to retained earnings	$ 147,000,000