Receivables (Tables)

6 Months Ended

Jun. 30, 2020

Receivables [Line Items]

Accounts Receivable Details

Details for accounts receivable included on the balance sheets were as follows (in millions):

	Alliant Energy						IPL						WPL
	June 30, 2020			December 31, 2019			June 30, 2020			December 31, 2019			June 30, 2020			December 31, 2019
Customer		$92.7			$91.6			$—			$—			$82.4			$83.5
Unbilled utility revenues	68.2			82.1			—			—			68.2			82.1
Deferred proceeds	194.1			187.7			194.1			187.7			—			—
Other	41.5			48.0			16.5			16.3			24.5			31.4
Allowance for expected credit losses	(10.0		)	(7.3		)	(1.7		)	(1.2		)	(8.2		)	(6.1		)
		$386.5			$402.1			$208.9			$202.8			$166.9			$190.9

Maximum And Average Outstanding Cash Proceeds

IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and six months ended June 30 were as follows (in millions):

	Three Months				Six Months
	2020		2019		2020		2019
Maximum outstanding aggregate cash proceeds		$65.0		$25.0		$96.0		$108.0
Average outstanding aggregate cash proceeds	11.1		2.6		17.3		41.6

Schedule of Sales Of Accounts Receivable Sold Under Agreement Table Text Block

The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):

	June 30, 2020		December 31, 2019
Customer accounts receivable		$113.5		$124.7
Unbilled utility revenues	92.3		95.5
Other receivables	0.4		0.9
Receivables sold to third party	206.2		221.1
Less: cash proceeds	1.0		27.0
Deferred proceeds	205.2		194.1
Less: allowance for expected credit losses	11.1		6.4
Fair value of deferred proceeds		$194.1		$187.7

Additional Attributes Of Receivables Sold Under The Receivables Agreement

Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and six months ended June 30 were as follows (in millions):

	Three Months				Six Months
	2020		2019		2020		2019
Collections		$453.0		$487.7		$994.4		$1,043.5
Write-offs, net of recoveries	1.2		2.6		3.3		8.1

IPL [Member]

Receivables [Line Items]

Accounts Receivable Details

Details for accounts receivable included on the balance sheets were as follows (in millions):

	Alliant Energy						IPL						WPL
	June 30, 2020			December 31, 2019			June 30, 2020			December 31, 2019			June 30, 2020			December 31, 2019
Customer		$92.7			$91.6			$—			$—			$82.4			$83.5
Unbilled utility revenues	68.2			82.1			—			—			68.2			82.1
Deferred proceeds	194.1			187.7			194.1			187.7			—			—
Other	41.5			48.0			16.5			16.3			24.5			31.4
Allowance for expected credit losses	(10.0		)	(7.3		)	(1.7		)	(1.2		)	(8.2		)	(6.1		)
		$386.5			$402.1			$208.9			$202.8			$166.9			$190.9

Maximum And Average Outstanding Cash Proceeds

IPL’s maximum and average outstanding cash proceeds (based on daily outstanding balances) related to the sales of accounts receivable program for the three and six months ended June 30 were as follows (in millions):

	Three Months				Six Months
	2020		2019		2020		2019
Maximum outstanding aggregate cash proceeds		$65.0		$25.0		$96.0		$108.0
Average outstanding aggregate cash proceeds	11.1		2.6		17.3		41.6

Schedule of Sales Of Accounts Receivable Sold Under Agreement Table Text Block

The attributes of IPL’s receivables sold under the Receivables Agreement were as follows (in millions):

	June 30, 2020		December 31, 2019
Customer accounts receivable		$113.5		$124.7
Unbilled utility revenues	92.3		95.5
Other receivables	0.4		0.9
Receivables sold to third party	206.2		221.1
Less: cash proceeds	1.0		27.0
Deferred proceeds	205.2		194.1
Less: allowance for expected credit losses	11.1		6.4
Fair value of deferred proceeds		$194.1		$187.7

Additional Attributes Of Receivables Sold Under The Receivables Agreement

Additional attributes of IPL’s receivables sold under the Receivables Agreement for the three and six months ended June 30 were as follows (in millions):

	Three Months				Six Months
	2020		2019		2020		2019
Collections		$453.0		$487.7		$994.4		$1,043.5
Write-offs, net of recoveries	1.2		2.6		3.3		8.1

WPL [Member]

Receivables [Line Items]

Accounts Receivable Details

Details for accounts receivable included on the balance sheets were as follows (in millions):

	Alliant Energy						IPL						WPL
	June 30, 2020			December 31, 2019			June 30, 2020			December 31, 2019			June 30, 2020			December 31, 2019
Customer		$92.7			$91.6			$—			$—			$82.4			$83.5
Unbilled utility revenues	68.2			82.1			—			—			68.2			82.1
Deferred proceeds	194.1			187.7			194.1			187.7			—			—
Other	41.5			48.0			16.5			16.3			24.5			31.4
Allowance for expected credit losses	(10.0		)	(7.3		)	(1.7		)	(1.2		)	(8.2		)	(6.1		)
		$386.5			$402.1			$208.9			$202.8			$166.9			$190.9