Restructuring, Reserve (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
2020 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		$ 1.6	$ 1.2
Charge to Income	$ 9.4	1.4
Cash	8.7	2.3
Non-Cash	0.0	0.0
Restructuring Reserve, Ending Balance	1.9	0.7	1.9
2019 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		4.1	8.2
Charge to Income		3.9	12.4
Cash		6.7	13.4
Non-Cash		1.2	2.8
Restructuring Reserve, Ending Balance	4.4	0.1	4.4
Severance & termination related costs | 2020 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		0.9	0.4
Charge to Income	0.2	0.3
Cash	0.6	0.5
Non-Cash	0.0	0.0
Restructuring Reserve, Ending Balance	0.0	0.7	0.0
Severance & termination related costs | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		1.4	5.3
Charge to Income		(0.1)	(0.1)
Cash		1.2	3.2
Non-Cash		0.0	0.0
Restructuring Reserve, Ending Balance	2.0	0.1	2.0
Accelerated depreciation & asset write-offs | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		0.0	0.0
Charge to Income		1.2	2.8
Cash		0.0	0.0
Non-Cash		1.2	2.8
Restructuring Reserve, Ending Balance	0.0	0.0	0.0
Other exit costs | 2020 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		0.7	0.8
Charge to Income	9.2	1.1
Cash	8.1	1.8
Non-Cash	0.0	0.0
Restructuring Reserve, Ending Balance	1.9	0.0	1.9
Other exit costs | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		2.2	2.9
Charge to Income		2.8	9.7
Cash		5.0	10.2
Non-Cash		0.0	0.0
Restructuring Reserve, Ending Balance	$ 2.4	0.0	$ 2.4
Net gain on sale of fixed assets | 2019 Restructuring Program
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		0.5
Charge to Income		0.0
Cash		0.5
Non-Cash		0.0
Restructuring Reserve, Ending Balance		$ 0.0