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Debt (Tables)
 9 Months Ended
Sep. 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):
September 30, 2018
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$136.8
 
$—
 
$38.4
Commercial paper weighted average interest rates
2.4%
 
N/A
 
2.2%
Available credit facility capacity
$863.2
 
$250.0
 
$311.6

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Maximum amount outstanding (based on daily outstanding balances)
$153.3
 
$424.4
 
$—
 
$20.0
 
$75.4
 
$271.2
Average amount outstanding (based on daily outstanding balances)
$80.8
 
$386.2
 
$—
 
$0.4
 
$23.1
 
$217.0
Weighted average interest rates
2.2%
 
1.3%
 
N/A
 
1.4%
 
2.0%
 
1.1%
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$424.4
 
$31.4
 
$20.0
 
$109.4
 
$271.2
Average amount outstanding (based on daily outstanding balances)
$207.6
 
$323.9
 
$1.7
 
$0.5
 
$26.6
 
$144.2
Weighted average interest rates
2.1%
 
1.1%
 
2.3%
 
1.2%
 
1.9%
 
1.0%
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):
September 30, 2018
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$136.8
 
$—
 
$38.4
Commercial paper weighted average interest rates
2.4%
 
N/A
 
2.2%
Available credit facility capacity
$863.2
 
$250.0
 
$311.6

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Maximum amount outstanding (based on daily outstanding balances)
$153.3
 
$424.4
 
$—
 
$20.0
 
$75.4
 
$271.2
Average amount outstanding (based on daily outstanding balances)
$80.8
 
$386.2
 
$—
 
$0.4
 
$23.1
 
$217.0
Weighted average interest rates
2.2%
 
1.3%
 
N/A
 
1.4%
 
2.0%
 
1.1%
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$424.4
 
$31.4
 
$20.0
 
$109.4
 
$271.2
Average amount outstanding (based on daily outstanding balances)
$207.6
 
$323.9
 
$1.7
 
$0.5
 
$26.6
 
$144.2
Weighted average interest rates
2.1%
 
1.1%
 
2.3%
 
1.2%
 
1.9%
 
1.0%
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):
September 30, 2018
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$136.8
 
$—
 
$38.4
Commercial paper weighted average interest rates
2.4%
 
N/A
 
2.2%
Available credit facility capacity
$863.2
 
$250.0
 
$311.6

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Maximum amount outstanding (based on daily outstanding balances)
$153.3
 
$424.4
 
$—
 
$20.0
 
$75.4
 
$271.2
Average amount outstanding (based on daily outstanding balances)
$80.8
 
$386.2
 
$—
 
$0.4
 
$23.1
 
$217.0
Weighted average interest rates
2.2%
 
1.3%
 
N/A
 
1.4%
 
2.0%
 
1.1%
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$446.5
 
$424.4
 
$31.4
 
$20.0
 
$109.4
 
$271.2
Average amount outstanding (based on daily outstanding balances)
$207.6
 
$323.9
 
$1.7
 
$0.5
 
$26.6
 
$144.2
Weighted average interest rates
2.1%
 
1.1%
 
2.3%
 
1.2%
 
1.9%
 
1.0%