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Debt
 6 Months Ended
Jun. 30, 2018
Debt [Line Items]  
Debt
DEBT
Note 7(a) Short-term Debt - 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.

As discussed in Note 7(b), in June 2018, AEF retired its $95 million term loan credit agreement expiring in 2018.

NOTE 7(b) Long-term Debt - In April 2018, AEF entered into a $300 million variable-rate (2.6% at June 30, 2018) term loan credit agreement (with Alliant Energy as guarantor) and used the proceeds from borrowings under this agreement for general corporate purposes. AEF’s term loan credit agreement expires in April 2020 and includes substantially the same financial covenants that are included in Alliant Energy’s credit facility agreement.

In June 2018, AEF (with Alliant Energy as guarantor) issued $400 million of 3.75% senior notes due 2023 and $300 million of 4.25% senior notes due 2028. The proceeds from the issuances were used by AEF to retire its $500 million and $95 million variable-rate term loan credit agreements expiring in 2018, to reduce Alliant Energy’s outstanding commercial paper and for general corporate purposes.

As of June 30, 2018, $125.0 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s balance sheets due to the existence of a long-term credit facility that back-stops this commercial paper balance, along with Alliant Energy’s and IPL’s intent and ability to refinance these balances on a long-term basis. As of June 30, 2018, this commercial paper balance had a 2.3% weighted average interest rate.
IPL [Member]  
Debt [Line Items]  
Debt
DEBT
Note 7(a) Short-term Debt - 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.

As discussed in Note 7(b), in June 2018, AEF retired its $95 million term loan credit agreement expiring in 2018.

NOTE 7(b) Long-term Debt - In April 2018, AEF entered into a $300 million variable-rate (2.6% at June 30, 2018) term loan credit agreement (with Alliant Energy as guarantor) and used the proceeds from borrowings under this agreement for general corporate purposes. AEF’s term loan credit agreement expires in April 2020 and includes substantially the same financial covenants that are included in Alliant Energy’s credit facility agreement.

In June 2018, AEF (with Alliant Energy as guarantor) issued $400 million of 3.75% senior notes due 2023 and $300 million of 4.25% senior notes due 2028. The proceeds from the issuances were used by AEF to retire its $500 million and $95 million variable-rate term loan credit agreements expiring in 2018, to reduce Alliant Energy’s outstanding commercial paper and for general corporate purposes.

As of June 30, 2018, $125.0 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s balance sheets due to the existence of a long-term credit facility that back-stops this commercial paper balance, along with Alliant Energy’s and IPL’s intent and ability to refinance these balances on a long-term basis. As of June 30, 2018, this commercial paper balance had a 2.3% weighted average interest rate.
WPL [Member]  
Debt [Line Items]  
Debt
DEBT
Note 7(a) Short-term Debt - 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.