Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($) shares in Millions		3 Months Ended		6 Months Ended	9 Months Ended
	Oct. 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Allowance for doubtful accounts		$ 21,700,000			$ 21,700,000		$ 17,400,000
Allowance for certain customer returns, rebates and incentives		$ 13,900,000			$ 13,900,000		$ 12,400,000
Antidilutive share-based compensation awards (in shares)		1.4	1.8	1.8	1.5
Capital expenditures in accounts payable or other current liabilities at period end					$ 10,400,000	$ 12,400,000
Outstanding purchase of common stock recorded in accounts payable					0	$ 6,000,000.0
Operating lease right-of-use assets		$ 320,300,000			320,300,000
Operating lease liability		$ 339,800,000			$ 339,800,000
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 | Accounting Standards Update 2016-02
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reclassification from AOCI to retained earnings	$ 146,800,000