Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		$ (136.9)	$ (191.6)
OCI before reclassifications	[1]	(6.8)	27.2
Reclassifications to earnings		0.3	2.7
Ending balance		(143.4)	(161.7)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(41.8)	(47.4)
OCI before reclassifications	[1]	(6.9)	33.7
Reclassifications to earnings		0.0	0.0
Ending balance		(48.7)	(13.7)
Pension and Post-retirement Activity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(97.3)	(142.1)
OCI before reclassifications	[1]	(1.1)	(3.7)
Reclassifications to earnings		1.1	1.7
Ending balance		(97.3)	(144.1)
Hedging Activity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		2.2	(2.1)
OCI before reclassifications	[1]	1.2	(2.8)
Reclassifications to earnings		(0.8)	1.0
Ending balance		$ 2.6	$ (3.9)

[1] OCI is defined as other comprehensive income (loss).