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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