Receivables (Tables)

9 Months Ended

Sep. 30, 2011

Receivables

Maximum And Average Outstanding Cash Proceeds

	Three Months				Nine Months
	2011		2010		2011		2010
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances)	$	160.0	$	155.0	$	160.0	$	160.0
Average outstanding aggregate cash proceeds (based on daily outstanding balances)		125.4		89.3		114.0		76.0
Costs incurred		0.3		0.3		1.1		1.0

Receivables Sold Under The Agreement

	Sep. 30, 2011		Dec. 31, 2010
Customer accounts receivable	$	139.8	$	133.0
Unbilled utility revenues		54.8		80.9
Other receivables		9.7		5.7
Receivables sold		204.3		219.6
Less: cash proceeds (a)		115.0		65.0
Deferred proceeds		89.3		154.6
Less: allowance for doubtful accounts		1.9		1.7
Fair value of deferred proceeds	$	87.4	$	152.9
Outstanding receivables past due	$	16.4	$	14.1

(a) Changes in cash proceeds during the nine months ended Sep. 30, 2011 are recorded in "Sales of accounts receivable" in operating activities in Alliant Energy's and IPL's Condensed Consolidated Statements of Cash Flows.

Additional Attributes Of Receivables Sold Under The Agreement

	Three Months				Nine Months
	2011		2010		2011		2010
Collections reinvested in receivables	$	482.3	$	518.4	$	1,367.8	$	925.5
Credit losses, net of recoveries		3.4		3.1		7.9		4.9