Restructuring, Business Transformation and Other Cost Saving Initiatives - Restructuring Reserve Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Expense	$ 35.3		$ 11.5
2023 Cost Saving Initiatives
Restructuring Cost and Reserve [Line Items]
Expense	36.5		15.6
Severance Costs | 2023 and 2022 Cost Saving Initiatives
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning	$ 31.9		$ 75.4
Expense		$ 35.3		$ 11.5
Payment		(25.8)		(42.2)
Foreign currency and other adjustments		(1.0)		0.8
Restructuring reserve, ending		$ 40.4		$ 45.5