Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables)

9 Months Ended

Jun. 30, 2012

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:

	June 30, 2012		September 30, 2011		June 30, 2011
Regulatory assets:
Income taxes recoverable	$	99.9	$	97.9	$	92.7
Underfunded pension and postretirement plans	144.6		150.7		116.0
Environmental costs	16.6		19.5		20.7
Deferred fuel and power costs	9.8		12.2		7.8
Removal costs, net	11.8		12.3		11.2
Other	8.3		7.8		8.9
Total regulatory assets	$	291.0	$	300.4	$	257.3
Regulatory liabilities:
Postretirement benefits	$	12.3	$	11.5	$	11.6
Environmental overcollections	3.7		4.7		6.2
Deferred fuel and power refunds	10.3		6.6		22.4
State tax benefits—distribution system repairs	7.0		6.3		6.2
Other	0.7		0.7		—
Total regulatory liabilities	$	34.0	$	29.8	$	46.4