Significant Accounting Policies - Narrative (Details) shares in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2023 USD ($) reporting_unit numberOfPrincipalActivities shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares
Property, Plant, and Equipment
Capitalized cloud computing arrangements	$ 20.5	$ 20.5	$ 21.9
Amortization expense for capitalized computer implementation costs		$ 3.3	3.0	$ 1.5
Number of reporting units | reporting_unit		1
Number of principal activities | numberOfPrincipalActivities		2
Customer incentives		$ 190.3	176.5	140.1
Reserves for customer programs and incentives	$ 3.2	3.2	2.8
Advertising costs		60.5	54.8	48.1
Total cost		$ 1,539.6	$ 142.6	$ 127.0
Common stock
Property, Plant, and Equipment
Shares repurchased (in shares) | shares	38.9	41.8	4.5	4.8
Total cost	$ 1,431.5	$ 0.5		$ 0.1
Retained (deficit) earnings
Property, Plant, and Equipment
Total cost		$ 1,539.1	$ 142.6	$ 126.9
Excise tax recognized	$ 14.3
Transferred at Point in Time
Property, Plant, and Equipment
Percentage of revenue recognized		95.00%
Minimum
Property, Plant, and Equipment
Lease term (less than one year, more than 20 years)		1 year
Expected timing of satisfaction for revenue performance obligations	10 years	10 years
Payment terms		30 days
Minimum | Buildings
Property, Plant, and Equipment
Estimated useful life of property, plant and equipment	7 years	7 years
Minimum | Machinery and equipment
Property, Plant, and Equipment
Estimated useful life of property, plant and equipment	5 years	5 years
Maximum
Property, Plant, and Equipment
Lease term (less than one year, more than 20 years)		20 years
Expected timing of satisfaction for revenue performance obligations	15 years	15 years
Payment terms		60 days
Maximum | Buildings
Property, Plant, and Equipment
Estimated useful life of property, plant and equipment	20 years	20 years
Maximum | Machinery and equipment
Property, Plant, and Equipment
Estimated useful life of property, plant and equipment	7 years	7 years