Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables)

6 Months Ended

Mar. 31, 2014

Regulated Operations [Abstract]

Regulatory assets and liabilities associated with Gas Utility and Electric Utility

The following regulatory assets and liabilities associated with Gas Utility and Electric Utility are included in our accompanying Condensed Consolidated Balance Sheets:

	March 31, 2014		September 30, 2013		March 31, 2013
Regulatory assets:
Income taxes recoverable	$	106.8	$	106.1	$	104.2
Underfunded pension and postretirement plans	91.0		94.5		181.3
Environmental costs	14.5		17.1		16.8
Deferred fuel and power costs	4.3		8.3		2.1
Removal costs, net	14.4		13.3		11.9
Other	4.9		5.6		6.0
Total regulatory assets	$	235.9	$	244.9	$	322.3
Regulatory liabilities:
Postretirement benefits	$	17.2	$	16.5	$	13.9
Environmental overcollections	1.9		2.6		3.0
Deferred fuel and power refunds	3.2		8.3		31.2
State tax benefits—distribution system repairs	9.0		8.4		7.9
Other	1.8		1.5		0.7
Total regulatory liabilities	$	33.1	$	37.3	$	56.7