Guarantee Arrangements (Details) - Customer obligation guarantees - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Guarantee Obligations
Guarantee obligations, maximum exposure	$ 606.3	$ 431.5
Aggregate amount of indebtedness which the Company is a party to through guarantee agreements	120.4	114.7
Changes in provision for loss on customer guarantees
Balance at beginning of year	4.6	4.3
Provision for new credit guarantees	3.8	2.0
Settlements made	(0.1)	(0.4)
Change for pre-existing guarantees, net	(0.4)	0.3
Amortization of previous guarantees	(2.1)	(1.5)
Foreign currency translation	(0.2)	(0.1)
Balance at end of year	$ 5.6	$ 4.6