Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables)

3 Months Ended

Dec. 31, 2013

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:

	December 31, 2013		September 30, 2013		December 31, 2012
Regulatory assets:
Income taxes recoverable	$	106.4	$	106.1	$	103.7
Underfunded pension and postretirement plans	92.8		94.5		184.8
Environmental costs	14.9		17.1		17.1
Deferred fuel and power costs	0.4		8.3		7.8
Removal costs, net	13.7		13.3		11.5
Other	5.7		5.6		5.7
Total regulatory assets	$	233.9	$	244.9	$	330.6
Regulatory liabilities:
Postretirement benefits	$	16.8	$	16.5	$	13.5
Environmental overcollections	2.3		2.6		3.1
Deferred fuel and power refunds	7.5		8.3		1.9
State tax benefits—distribution system repairs	8.7		8.4		7.7
Other	1.3		1.5		0.6
Total regulatory liabilities	$	36.6	$	37.3	$	26.8