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Debt (Tables)
 9 Months Ended
Sep. 30, 2019
Short-term Debt [Line Items]  
Other Short-Term Borrowings Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2019
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$349.6
 
$—
 
$—
Commercial paper weighted average interest rates
2.3%
 
N/A
 
N/A
Available credit facility capacity
$650.4
 
$250.0
 
$300.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Maximum amount outstanding (based on daily outstanding balances)
$471.7
 
$153.3
 
$—
 
$—
 
$89.7
 
$75.4
Average amount outstanding (based on daily outstanding balances)
$399.5
 
$80.8
 
$—
 
$—
 
$27.0
 
$23.1
Weighted average interest rates
2.5%
 
2.2%
 
N/A
 
N/A
 
2.3%
 
2.0%
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$600.6
 
$446.5
 
$50.4
 
$31.4
 
$195.1
 
$109.4
Average amount outstanding (based on daily outstanding balances)
$476.3
 
$207.6
 
$0.2
 
$1.7
 
$101.8
 
$26.6
Weighted average interest rates
2.6%
 
2.1%
 
2.8%
 
2.3%
 
2.5%
 
1.9%
IPL [Member]  
Short-term Debt [Line Items]  
Other Short-Term Borrowings Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2019
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$349.6
 
$—
 
$—
Commercial paper weighted average interest rates
2.3%
 
N/A
 
N/A
Available credit facility capacity
$650.4
 
$250.0
 
$300.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Maximum amount outstanding (based on daily outstanding balances)
$471.7
 
$153.3
 
$—
 
$—
 
$89.7
 
$75.4
Average amount outstanding (based on daily outstanding balances)
$399.5
 
$80.8
 
$—
 
$—
 
$27.0
 
$23.1
Weighted average interest rates
2.5%
 
2.2%
 
N/A
 
N/A
 
2.3%
 
2.0%
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$600.6
 
$446.5
 
$50.4
 
$31.4
 
$195.1
 
$109.4
Average amount outstanding (based on daily outstanding balances)
$476.3
 
$207.6
 
$0.2
 
$1.7
 
$101.8
 
$26.6
Weighted average interest rates
2.6%
 
2.1%
 
2.8%
 
2.3%
 
2.5%
 
1.9%
WPL [Member]  
Short-term Debt [Line Items]  
Other Short-Term Borrowings Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
September 30, 2019
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$349.6
 
$—
 
$—
Commercial paper weighted average interest rates
2.3%
 
N/A
 
N/A
Available credit facility capacity
$650.4
 
$250.0
 
$300.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Maximum amount outstanding (based on daily outstanding balances)
$471.7
 
$153.3
 
$—
 
$—
 
$89.7
 
$75.4
Average amount outstanding (based on daily outstanding balances)
$399.5
 
$80.8
 
$—
 
$—
 
$27.0
 
$23.1
Weighted average interest rates
2.5%
 
2.2%
 
N/A
 
N/A
 
2.3%
 
2.0%
Nine Months Ended September 30
 
 
 
 
 
 
 
 
 
 
 
Maximum amount outstanding (based on daily outstanding balances)
$600.6
 
$446.5
 
$50.4
 
$31.4
 
$195.1
 
$109.4
Average amount outstanding (based on daily outstanding balances)
$476.3
 
$207.6
 
$0.2
 
$1.7
 
$101.8
 
$26.6
Weighted average interest rates
2.6%
 
2.1%
 
2.8%
 
2.3%
 
2.5%
 
1.9%