Receivables (Tables)

3 Months Ended

Mar. 31, 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
	March 31, 2020			December 31, 2019			March 31, 2020			December 31, 2019			March 31, 2020			December 31, 2019
Customer		$100.8			$91.6			$—			$—			$90.6			$83.5
Unbilled utility revenues	68.9			82.1			—			—			68.9			82.1
Deferred proceeds	188.0			187.7			188.0			187.7			—			—
Other	47.7			48.0			17.8			16.3			29.6			31.4
Allowance for expected credit losses	(9.0		)	(7.3		)	(1.0		)	(1.2		)	(8.0		)	(6.1		)
		$396.4			$402.1			$204.8			$202.8			$181.1			$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 months ended March 31 were as follows (in millions):

	2020		2019
Maximum outstanding aggregate cash proceeds		$96.0		$108.0
Average outstanding aggregate cash proceeds	23.6		81.0

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):

	March 31, 2020		December 31, 2019
Customer accounts receivable		$131.2		$124.7
Unbilled utility revenues	83.0		95.5
Other receivables	0.9		0.9
Receivables sold to third party	215.1		221.1
Less: cash proceeds	16.0		27.0
Deferred proceeds	199.1		194.1
Less: allowance for expected credit losses	11.1		6.4
Fair value of deferred proceeds		$188.0		$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 months ended March 31 were as follows (in millions):

	2020		2019
Collections		$541.4		$555.8
Write-offs, net of recoveries	2.1		5.5

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
	March 31, 2020			December 31, 2019			March 31, 2020			December 31, 2019			March 31, 2020			December 31, 2019
Customer		$100.8			$91.6			$—			$—			$90.6			$83.5
Unbilled utility revenues	68.9			82.1			—			—			68.9			82.1
Deferred proceeds	188.0			187.7			188.0			187.7			—			—
Other	47.7			48.0			17.8			16.3			29.6			31.4
Allowance for expected credit losses	(9.0		)	(7.3		)	(1.0		)	(1.2		)	(8.0		)	(6.1		)
		$396.4			$402.1			$204.8			$202.8			$181.1			$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 months ended March 31 were as follows (in millions):

	2020		2019
Maximum outstanding aggregate cash proceeds		$96.0		$108.0
Average outstanding aggregate cash proceeds	23.6		81.0

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):

	March 31, 2020		December 31, 2019
Customer accounts receivable		$131.2		$124.7
Unbilled utility revenues	83.0		95.5
Other receivables	0.9		0.9
Receivables sold to third party	215.1		221.1
Less: cash proceeds	16.0		27.0
Deferred proceeds	199.1		194.1
Less: allowance for expected credit losses	11.1		6.4
Fair value of deferred proceeds		$188.0		$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 months ended March 31 were as follows (in millions):

	2020		2019
Collections		$541.4		$555.8
Write-offs, net of recoveries	2.1		5.5

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
	March 31, 2020			December 31, 2019			March 31, 2020			December 31, 2019			March 31, 2020			December 31, 2019
Customer		$100.8			$91.6			$—			$—			$90.6			$83.5
Unbilled utility revenues	68.9			82.1			—			—			68.9			82.1
Deferred proceeds	188.0			187.7			188.0			187.7			—			—
Other	47.7			48.0			17.8			16.3			29.6			31.4
Allowance for expected credit losses	(9.0		)	(7.3		)	(1.0		)	(1.2		)	(8.0		)	(6.1		)
		$396.4			$402.1			$204.8			$202.8			$181.1			$190.9