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Debt (Tables)
 6 Months Ended
Jun. 30, 2015
Debt Disclosure [Line Items]  
Other Short-Term Borrowings
Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions):
 
Alliant Energy
 
Parent
 
 
 
 
June 30, 2015
(Consolidated)
 
Company
 
IPL
 
WPL
Commercial paper:
 
 
 
 
 
 
 
Amount outstanding
$120.9
 
$120.9
 
$—
 
$—
Weighted average remaining maturity
6 days
 
6 days
 
N/A
 
N/A
Weighted average interest rates
0.4%
 
0.4%
 
N/A
 
N/A
Available credit facility capacity (a)
$767.9
 
$179.1
 
$188.8
 
$400.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Maximum amount outstanding
(based on daily outstanding balances)

$152.6

 

$311.6

 

$9.7

 

$6.0

 
$—
 

$168.4

Average amount outstanding
(based on daily outstanding balances)

$93.2

 

$262.7

 

$0.1

 

$0.1

 
$—
 

$141.8

Weighted average interest rates
0.5
%
 
0.2
%
 
0.5
%
 
0.2
%
 
N/A
 
0.1
%
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding
(based on daily outstanding balances)

$152.6

 

$316.2

 

$9.7

 

$10.0

 
$—
 

$204.7

Average amount outstanding
(based on daily outstanding balances)

$110.5

 

$269.1

 

$0.1

 

$0.2

 
$—
 

$157.3

Weighted average interest rates
0.4
%
 
0.2
%
 
0.5
%
 
0.2
%
 
N/A
 
0.1
%


(a)
Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at June 30, 2015. Refer to Note 7(b) for further discussion of $111.2 million of commercial paper outstanding at June 30, 2015 classified as long-term debt on Alliant Energy’s and IPL’s balance sheets.
IPL [Member]  
Debt Disclosure [Line Items]  
Other Short-Term Borrowings
Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions):
 
Alliant Energy
 
Parent
 
 
 
 
June 30, 2015
(Consolidated)
 
Company
 
IPL
 
WPL
Commercial paper:
 
 
 
 
 
 
 
Amount outstanding
$120.9
 
$120.9
 
$—
 
$—
Weighted average remaining maturity
6 days
 
6 days
 
N/A
 
N/A
Weighted average interest rates
0.4%
 
0.4%
 
N/A
 
N/A
Available credit facility capacity (a)
$767.9
 
$179.1
 
$188.8
 
$400.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Maximum amount outstanding
(based on daily outstanding balances)

$152.6

 

$311.6

 

$9.7

 

$6.0

 
$—
 

$168.4

Average amount outstanding
(based on daily outstanding balances)

$93.2

 

$262.7

 

$0.1

 

$0.1

 
$—
 

$141.8

Weighted average interest rates
0.5
%
 
0.2
%
 
0.5
%
 
0.2
%
 
N/A
 
0.1
%
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding
(based on daily outstanding balances)

$152.6

 

$316.2

 

$9.7

 

$10.0

 
$—
 

$204.7

Average amount outstanding
(based on daily outstanding balances)

$110.5

 

$269.1

 

$0.1

 

$0.2

 
$—
 

$157.3

Weighted average interest rates
0.4
%
 
0.2
%
 
0.5
%
 
0.2
%
 
N/A
 
0.1
%


(a)
Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at June 30, 2015. Refer to Note 7(b) for further discussion of $111.2 million of commercial paper outstanding at June 30, 2015 classified as long-term debt on Alliant Energy’s and IPL’s balance sheets.
WPL [Member]  
Debt Disclosure [Line Items]  
Other Short-Term Borrowings
Information regarding commercial paper classified as short-term debt and back-stopped by the credit facilities was as follows (dollars in millions):
 
Alliant Energy
 
Parent
 
 
 
 
June 30, 2015
(Consolidated)
 
Company
 
IPL
 
WPL
Commercial paper:
 
 
 
 
 
 
 
Amount outstanding
$120.9
 
$120.9
 
$—
 
$—
Weighted average remaining maturity
6 days
 
6 days
 
N/A
 
N/A
Weighted average interest rates
0.4%
 
0.4%
 
N/A
 
N/A
Available credit facility capacity (a)
$767.9
 
$179.1
 
$188.8
 
$400.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Maximum amount outstanding
(based on daily outstanding balances)

$152.6

 

$311.6

 

$9.7

 

$6.0

 
$—
 

$168.4

Average amount outstanding
(based on daily outstanding balances)

$93.2

 

$262.7

 

$0.1

 

$0.1

 
$—
 

$141.8

Weighted average interest rates
0.5
%
 
0.2
%
 
0.5
%
 
0.2
%
 
N/A
 
0.1
%
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding
(based on daily outstanding balances)

$152.6

 

$316.2

 

$9.7

 

$10.0

 
$—
 

$204.7

Average amount outstanding
(based on daily outstanding balances)

$110.5

 

$269.1

 

$0.1

 

$0.2

 
$—
 

$157.3

Weighted average interest rates
0.4
%
 
0.2
%
 
0.5
%
 
0.2
%
 
N/A
 
0.1
%


(a)
Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at June 30, 2015. Refer to Note 7(b) for further discussion of $111.2 million of commercial paper outstanding at June 30, 2015 classified as long-term debt on Alliant Energy’s and IPL’s balance sheets.