Restructuring, Business Transformation and Other Cost Saving Initiatives - Restructuring Reserve Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Expense	$ 11.5		$ 9.6
2023 Cost Saving Initiatives
Restructuring Cost and Reserve [Line Items]
Expense	15.6
Severance Costs | 2023 and 2022 Cost Saving Initiatives
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning	$ 75.4		$ 35.9
Expense		$ 11.5		$ 7.1
Payment		(42.2)		(15.6)
Foreign currency and other adjustments		0.8		0.6
Restructuring reserve, ending		$ 45.5		$ 28.0