Receivables - Credit Risk Profile by Internally Assigned Grade (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013
Low	$ 138.9		$ 126.1
Medium	82.6		100.3
High	187.0	[1]	247.0	[1]
Total recorded investment	408.5		473.4
Impaired Financing Receivable, Recorded Investment	103.8		80.7
Contracts [Member]
Low	138.9		126.1
Medium	82.6		100.2
High	111.5	[1]	156.9	[1]
Total recorded investment	333.0		383.2
Notes [Member]
Low	0		0
Medium	0		0.1
High	75.5	[1]	90.1	[1]
Total recorded investment	75.5		90.2
Alabama [Member]
Impaired Financing Receivable, Recorded Investment	$ 75.0	[1]	$ 75.0	[1]

[1] Alabama impaired note included