Restructuring, Reserve (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Restructuring reserve			$ 9.4
2020 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	$ 1.2
Charge to Income	4.0
Cash	3.3
Non-Cash	0.0
March 31, 2020	1.9
2019 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	8.2	$ 9.8
Charge to Income	6.6	6.3
Cash	8.7	1.3
Non-Cash	1.4	3.4
March 31, 2020	4.7	11.4
Other Liabilities
Restructuring Reserve [Roll Forward]
Restructuring reserve	6.6
Severance & termination related costs | 2020 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	0.4
Charge to Income	0.3
Cash	0.0
Non-Cash	0.0
March 31, 2020	0.7
Severance & termination related costs | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	5.3	9.8
Charge to Income	0.1	0.9
Cash	3.4	0.0
Non-Cash	0.0	0.0
March 31, 2020	2.0	10.7
Accelerated depreciation & asset write-offs | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	0.0	0.0
Charge to Income	1.4	3.4
Cash	0.0	0.0
Non-Cash	1.4	3.4
March 31, 2020	0.0	0.0
Other exit costs | 2020 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	0.8
Charge to Income	3.7
Cash	3.3
Non-Cash	0.0
March 31, 2020	1.2
Other exit costs | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
44104	2.9	0.0
Charge to Income	5.1	2.0
Cash	5.3	1.3
Non-Cash	0.0	0.0
March 31, 2020	$ 2.7	$ 0.7