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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Line Items]  
Other Short-Term Borrowings
Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
June 30, 2018
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$82.5
 
$—
 
$26.4
Commercial paper weighted average interest rates
2.2%
 
N/A
 
2.0%
Available credit facility capacity (a)
$792.5
 
$125.0
 
$323.6

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$397.6
 
$31.4
 
$14.6
 
$109.4
 
$212.5
Average amount outstanding (based on daily outstanding balances)
$234.5
 
$307.8
 
$5.1
 
$1.0
 
$45.2
 
$134.9
Weighted average interest rates
2.2%
 
1.1%
 
2.3%
 
1.2%
 
1.8%
 
1.0%
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$397.6
 
$31.4
 
$14.6
 
$109.4
 
$212.5
Average amount outstanding (based on daily outstanding balances)
$272.1
 
$292.3
 
$2.6
 
$0.6
 
$28.4
 
$107.2
Weighted average interest rates
2.0%
 
1.0%
 
2.3%
 
1.2%
 
1.8%
 
0.9%


(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, 2018.
IPL [Member]  
Debt Disclosure [Line Items]  
Other Short-Term Borrowings
Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
June 30, 2018
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$82.5
 
$—
 
$26.4
Commercial paper weighted average interest rates
2.2%
 
N/A
 
2.0%
Available credit facility capacity (a)
$792.5
 
$125.0
 
$323.6

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$397.6
 
$31.4
 
$14.6
 
$109.4
 
$212.5
Average amount outstanding (based on daily outstanding balances)
$234.5
 
$307.8
 
$5.1
 
$1.0
 
$45.2
 
$134.9
Weighted average interest rates
2.2%
 
1.1%
 
2.3%
 
1.2%
 
1.8%
 
1.0%
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$397.6
 
$31.4
 
$14.6
 
$109.4
 
$212.5
Average amount outstanding (based on daily outstanding balances)
$272.1
 
$292.3
 
$2.6
 
$0.6
 
$28.4
 
$107.2
Weighted average interest rates
2.0%
 
1.0%
 
2.3%
 
1.2%
 
1.8%
 
0.9%


(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, 2018.
WPL [Member]  
Debt Disclosure [Line Items]  
Other Short-Term Borrowings
Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
June 30, 2018
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$82.5
 
$—
 
$26.4
Commercial paper weighted average interest rates
2.2%
 
N/A
 
2.0%
Available credit facility capacity (a)
$792.5
 
$125.0
 
$323.6

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$397.6
 
$31.4
 
$14.6
 
$109.4
 
$212.5
Average amount outstanding (based on daily outstanding balances)
$234.5
 
$307.8
 
$5.1
 
$1.0
 
$45.2
 
$134.9
Weighted average interest rates
2.2%
 
1.1%
 
2.3%
 
1.2%
 
1.8%
 
1.0%
Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$397.6
 
$31.4
 
$14.6
 
$109.4
 
$212.5
Average amount outstanding (based on daily outstanding balances)
$272.1
 
$292.3
 
$2.6
 
$0.6
 
$28.4
 
$107.2
Weighted average interest rates
2.0%
 
1.0%
 
2.3%
 
1.2%
 
1.8%
 
0.9%


(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, 2018.