Goodwill (Schedule of Goodwill by Segment) (Details) $ in Millions	9 Months Ended
	Jun. 30, 2026 USD ($)
Goodwill [Roll Forward]
Goodwill, net, beginning balance	$ 963.9
Currency translation	(6.5)
Goodwill, net, ending balance	957.4
Americas
Goodwill [Roll Forward]
Goodwill, net, beginning balance	143.5
Currency translation	1.7
Goodwill, net, ending balance	145.2
Asia
Goodwill [Roll Forward]
Goodwill, net, beginning balance	172.5
Currency translation	0.0
Goodwill, net, ending balance	172.5
Europe
Goodwill [Roll Forward]
Goodwill, net, beginning balance	597.9
Currency translation	(8.2)
Goodwill, net, ending balance	589.7
Middle East and India
Goodwill [Roll Forward]
Goodwill, net, beginning balance	15.8
Currency translation	0.0
Goodwill, net, ending balance	15.8
Corporate and other
Goodwill [Roll Forward]
Goodwill, net, beginning balance	34.2
Currency translation	0.0
Goodwill, net, ending balance	$ 34.2