Restructuring (Restructuring and Related Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring related expense	$ 30.3	$ 12.1
2019 Integration Related Restructuring Program
Restructuring Cost and Reserve [Line Items]
Charge to Income	29.1	12.1
2019 Integration Related Restructuring Program | Cost of products sold
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs	0.8	9.8
Accelerated depreciation	12.0	2.3
Other costs	16.3	0.0
2020 Cost Structure Restructuring Program
Restructuring Cost and Reserve [Line Items]
Charge to Income	1.2	0.0
2020 Cost Structure Restructuring Program | Cost of products sold
Restructuring Cost and Reserve [Line Items]
Other costs	0.2	0.0
2020 Cost Structure Restructuring Program | Selling, General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Severance and related benefit costs	0.4	0.0
Other costs	$ 0.6	$ 0.0