Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables)

12 Months Ended

Sep. 30, 2013

Regulated Operations [Abstract]

Regulatory assets and liabilities associated with Gas Utility and Electric Utility

The following regulatory assets and liabilities associated with Utilities are included in our accompanying balance sheets at September 30:

	2013		2012
Regulatory assets:
Income taxes recoverable	$	106.1	$	103.2
Underfunded pension and postretirement plans	94.5		188.2
Environmental costs	17.1		16.8
Deferred fuel and power costs	8.3		11.6
Removal costs, net	13.3		12.7
Other	5.6		5.9
Total regulatory assets	$	244.9	$	338.4
Regulatory liabilities:
Postretirement benefits	$	16.5	$	13.1
Environmental overcollections	2.6		2.9
Deferred fuel and power refunds	8.3		4.4
State tax benefits — distribution system repairs	8.4		7.4
Other	1.5		0.5
Total regulatory liabilities	$	37.3	$	28.3