Restructuring Charges - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (5.0)	$ 97.0	$ 0.0
Restructuring charges, net of tax		$ 73.0
Restructuring charges, per diluted share (in USD per share)		$ 0.64
Expected restructuring charges	92.0
Payments for restructuring	38.0	$ 27.0
Accrual adjustment	5.0
Restructuring reserve	27.0	70.0
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 22.0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of product and service sold
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 66.0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense
Research and development expense
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 9.0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		92.0
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 5.0