Receivables - Allowances for Credit Losses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Accounts Receivable:
Ending balance	$ 92.1	$ 78.5
Accounts Receivable [Member]
Accounts Receivable:
Beginning balance	22.3	19.1	17.6
Charge-offs	(2.1)	(3.1)	(2.8)
Recoveries	0.1	0.1	1.1
Provisions	3.9	6.2	3.2
Ending balance	24.2	22.3	19.1
Customer Financing [Member]
Accounts Receivable:
Beginning balance	78.5	72.8	71.4
Charge-offs	(5.4)	0	(10.4)
Recoveries	0	0	0
Provisions	19.0	5.7	11.8
Ending balance	92.1	78.5	72.8
Current [Member]
Accounts Receivable:
Ending balance	85.2	67.7	51.6
Non-Current [Member]
Accounts Receivable:
Ending balance	$ 6.9	$ 10.8	$ 21.2