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Debt
 6 Months Ended
Jun. 30, 2019
Debt [Line Items]  
Debt DEBT
NOTE 6(a) Short-term Debt - In March 2019, Alliant Energy, IPL and WPL extended their single credit facility agreement by one year, which currently expires in August 2023. As of June 30, 2019, the short-term borrowing capacity under the agreement totaled $1 billion ($450 million for Alliant Energy at the parent company, $250 million for IPL and $300 million for WPL). Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
June 30, 2019
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$390.5
 
$—
 
$—
Commercial paper weighted average interest rates
2.6%
 
N/A
 
N/A
Available credit facility capacity
$609.5
 
$250.0
 
$300.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Maximum amount outstanding (based on daily outstanding balances)
$590.2
 
$446.5
 
$—
 
$31.4
 
$193.3
 
$109.4
Average amount outstanding (based on daily outstanding balances)
$531.7
 
$234.5
 
$—
 
$5.1
 
$141.6
 
$45.2
Weighted average interest rates
2.7%
 
2.2%
 
N/A
 
2.3%
 
2.5%
 
1.8%
Six Months Ended June 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)
$515.4
 
$272.1
 
$0.3
 
$2.6
 
$139.8
 
$28.4
Weighted average interest rates
2.7%
 
2.0%
 
2.8%
 
2.3%
 
2.5%
 
1.8%


NOTE 6(b) Long-term Debt - In April 2019, IPL issued $300 million of 3.60% senior debentures due 2029. The senior debentures were issued as green bonds, and all of the net proceeds were allocated for the construction and development of IPL’s wind projects.

In June 2019, WPL issued $350 million of 3.00% debentures due 2029. The net proceeds from the issuance were used by WPL to reduce its outstanding commercial paper and retire its $250 million 5% debentures that matured in July 2019.
IPL [Member]  
Debt [Line Items]  
Debt DEBT
NOTE 6(a) Short-term Debt - In March 2019, Alliant Energy, IPL and WPL extended their single credit facility agreement by one year, which currently expires in August 2023. As of June 30, 2019, the short-term borrowing capacity under the agreement totaled $1 billion ($450 million for Alliant Energy at the parent company, $250 million for IPL and $300 million for WPL). Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
June 30, 2019
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$390.5
 
$—
 
$—
Commercial paper weighted average interest rates
2.6%
 
N/A
 
N/A
Available credit facility capacity
$609.5
 
$250.0
 
$300.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Maximum amount outstanding (based on daily outstanding balances)
$590.2
 
$446.5
 
$—
 
$31.4
 
$193.3
 
$109.4
Average amount outstanding (based on daily outstanding balances)
$531.7
 
$234.5
 
$—
 
$5.1
 
$141.6
 
$45.2
Weighted average interest rates
2.7%
 
2.2%
 
N/A
 
2.3%
 
2.5%
 
1.8%
Six Months Ended June 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)
$515.4
 
$272.1
 
$0.3
 
$2.6
 
$139.8
 
$28.4
Weighted average interest rates
2.7%
 
2.0%
 
2.8%
 
2.3%
 
2.5%
 
1.8%


NOTE 6(b) Long-term Debt - In April 2019, IPL issued $300 million of 3.60% senior debentures due 2029. The senior debentures were issued as green bonds, and all of the net proceeds were allocated for the construction and development of IPL’s wind projects.

In June 2019, WPL issued $350 million of 3.00% debentures due 2029. The net proceeds from the issuance were used by WPL to reduce its outstanding commercial paper and retire its $250 million 5% debentures that matured in July 2019.
WPL [Member]  
Debt [Line Items]  
Debt DEBT
NOTE 6(a) Short-term Debt - In March 2019, Alliant Energy, IPL and WPL extended their single credit facility agreement by one year, which currently expires in August 2023. As of June 30, 2019, the short-term borrowing capacity under the agreement totaled $1 billion ($450 million for Alliant Energy at the parent company, $250 million for IPL and $300 million for WPL). Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):
June 30, 2019
Alliant Energy
 
IPL
 
WPL
Commercial paper outstanding
$390.5
 
$—
 
$—
Commercial paper weighted average interest rates
2.6%
 
N/A
 
N/A
Available credit facility capacity
$609.5
 
$250.0
 
$300.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended June 30
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Maximum amount outstanding (based on daily outstanding balances)
$590.2
 
$446.5
 
$—
 
$31.4
 
$193.3
 
$109.4
Average amount outstanding (based on daily outstanding balances)
$531.7
 
$234.5
 
$—
 
$5.1
 
$141.6
 
$45.2
Weighted average interest rates
2.7%
 
2.2%
 
N/A
 
2.3%
 
2.5%
 
1.8%
Six Months Ended June 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)
$515.4
 
$272.1
 
$0.3
 
$2.6
 
$139.8
 
$28.4
Weighted average interest rates
2.7%
 
2.0%
 
2.8%
 
2.3%
 
2.5%
 
1.8%


NOTE 6(b) Long-term Debt - In April 2019, IPL issued $300 million of 3.60% senior debentures due 2029. The senior debentures were issued as green bonds, and all of the net proceeds were allocated for the construction and development of IPL’s wind projects.

In June 2019, WPL issued $350 million of 3.00% debentures due 2029. The net proceeds from the issuance were used by WPL to reduce its outstanding commercial paper and retire its $250 million 5% debentures that matured in July 2019.