Receivables - Age Analysis of Recorded Investment (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013
Past Due:
1-29 days	$ 8.2		$ 19.9
30-59 days	5.5		6.5
60-89 days	4.8		5.8
Over 90 days	90.4		71.0
Total past due	108.9		103.2
Total current	299.6		370.2
Grand total	408.5		473.4
Over 90 days and accruing interest	0.6		1.3
Nonaccrual status (not accruing interest)	97.4		89.7
Alabama [Member]
Past Due:
Financing Receivable Impaired Past Due	70.0	[1]	56.2	[1]
Financing Receivable Impaired Not Past Due	5.0	[2]	18.8	[2]
Contracts [Member]
Past Due:
1-29 days	6.9		18.4
30-59 days	4.2		5.1
60-89 days	3.6		4.5
Over 90 days	23.7		16.1
Total past due	38.4		44.1
Total current	294.6		339.1
Grand total	333.0		383.2
Over 90 days and accruing interest	0.6		0
Nonaccrual status (not accruing interest)	21.9		13.5
Notes [Member]
Past Due:
1-29 days	1.3		1.5
30-59 days	1.3		1.4
60-89 days	1.2		1.3
Over 90 days	66.7		54.9
Total past due	70.5		59.1
Total current	5.0		31.1
Grand total	75.5		90.2
Over 90 days and accruing interest	0		1.3
Nonaccrual status (not accruing interest)	$ 75.5		$ 76.2

[1] Alabama impaired note included in total past due.

[2] Alabama impaired note included in amount not past due.