Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended
	Oct. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Allowance for doubtful accounts		$ 19.8		$ 17.4
Allowance for certain customer returns, rebates and incentives		$ 12.4		$ 12.4
Antidilutive share-based compensation awards (in shares)		2.4	1.8
Capital expenditures in accounts payable or other current liabilities at period end		$ 10.9	$ 17.1
Outstanding purchase of common stock recorded in accounts payable		3.5	$ 16.0
Operating lease right-of-use assets		$ 331.1
Accounting Standards Update 2016-02 | Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating lease right-of-use assets	$ 316.0
Accounting Standards Update 2016-02 | Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating lease right-of-use assets	329.0
Accumulated other comprehensive loss | Accounting Standards Update 2016-02
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reclassification from AOCI to retained earnings	(146.8)
Retained earnings | Accounting Standards Update 2016-02
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Reclassification from AOCI to retained earnings	$ 147.0