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Valuation and Qualifying Accounts And Reserves
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Accounts And Reserves
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
 
 
 
 
Additions
 
 
 
Balance,
Charged to
Charged to Other
 
Balance,
Description
January 1
Expense
Accounts (a)
Deductions (b)
December 31
 
(in millions)
Valuation and Qualifying Accounts Which are Deducted in the Balance Sheet From the Assets to Which They Apply:
 
Accumulated Provision for Uncollectible Accounts:
 
 
 
 
 
 
Alliant Energy (c)
 
 
 
 
 
 
 
 
Year ended December 31, 2016

$4.8


$17.4


$8.8


$22.3


$8.7

 
 
 
Year ended December 31, 2015
5.1

8.1

3.0

11.4

4.8

 
 
 
Year ended December 31, 2014
4.8

11.7

4.1

15.5

5.1

 
 
IPL (c)
 
 
 
 
 
 
 
Year ended December 31, 2016

$0.6


$17.2


$—


$16.7


$1.1

 
 
 
Year ended December 31, 2015
0.4

8.1

—

7.9

0.6

 
 
 
Year ended December 31, 2014
0.7

11.5

—

11.8

0.4

 
 
WPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$3.7


$0.1


$8.8


$5.5


$7.1

 
 
 
Year ended December 31, 2015
4.2

—

3.0

3.5

3.7

 
 
 
Year ended December 31, 2014
1.7

—

4.1

1.6

4.2

Note: The above provisions relate to various customer, notes and other receivable balances included in various line items on the respective balance sheets.

Other Reserves:
 
Accumulated Provision for Other Reserves (d):
 
 
Alliant Energy
 
 
 
 
 
 
 
Year ended December 31, 2016

$27.1


$6.1


$—


$8.1


$25.1

 
 
 
Year ended December 31, 2015
32.6

6.5

—

12.0

27.1

 
 
 
Year ended December 31, 2014
38.2

12.5

—

18.1

32.6

 
 
IPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$9.4


$1.0


$—


$1.7


$8.7

 
 
 
Year ended December 31, 2015
10.6

2.1

—

3.3

9.4

 
 
 
Year ended December 31, 2014
18.1

3.9

—

11.4

10.6

 
 
WPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$11.4


$1.8


$—


$5.1


$8.1

 
 
 
Year ended December 31, 2015
16.3

0.7

—

5.6

11.4

 
 
 
Year ended December 31, 2014
16.2

2.5

—

2.4

16.3


(a)
Accumulated provision for uncollectible accounts: In accordance with its regulatory treatment, certain amounts provided by WPL are recorded in regulatory assets. WPL expenses these amounts when an uncollectible account is written-off.
(b)
Deductions are of the nature for which the reserves were created. In the case of the accumulated provision for uncollectible accounts, deductions from this reserve are reduced by recoveries of amounts previously written off.
(c)
Refer to Note 5(b) for discussion of IPL’s sales of accounts receivable program.
(d)
Other reserves are largely related to injury and damage claims arising in the ordinary course of business.
IPL [Member]  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Accounts And Reserves
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
 
 
 
 
Additions
 
 
 
Balance,
Charged to
Charged to Other
 
Balance,
Description
January 1
Expense
Accounts (a)
Deductions (b)
December 31
 
(in millions)
Valuation and Qualifying Accounts Which are Deducted in the Balance Sheet From the Assets to Which They Apply:
 
Accumulated Provision for Uncollectible Accounts:
 
 
 
 
 
 
Alliant Energy (c)
 
 
 
 
 
 
 
 
Year ended December 31, 2016

$4.8


$17.4


$8.8


$22.3


$8.7

 
 
 
Year ended December 31, 2015
5.1

8.1

3.0

11.4

4.8

 
 
 
Year ended December 31, 2014
4.8

11.7

4.1

15.5

5.1

 
 
IPL (c)
 
 
 
 
 
 
 
Year ended December 31, 2016

$0.6


$17.2


$—


$16.7


$1.1

 
 
 
Year ended December 31, 2015
0.4

8.1

—

7.9

0.6

 
 
 
Year ended December 31, 2014
0.7

11.5

—

11.8

0.4

 
 
WPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$3.7


$0.1


$8.8


$5.5


$7.1

 
 
 
Year ended December 31, 2015
4.2

—

3.0

3.5

3.7

 
 
 
Year ended December 31, 2014
1.7

—

4.1

1.6

4.2

Note: The above provisions relate to various customer, notes and other receivable balances included in various line items on the respective balance sheets.

Other Reserves:
 
Accumulated Provision for Other Reserves (d):
 
 
Alliant Energy
 
 
 
 
 
 
 
Year ended December 31, 2016

$27.1


$6.1


$—


$8.1


$25.1

 
 
 
Year ended December 31, 2015
32.6

6.5

—

12.0

27.1

 
 
 
Year ended December 31, 2014
38.2

12.5

—

18.1

32.6

 
 
IPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$9.4


$1.0


$—


$1.7


$8.7

 
 
 
Year ended December 31, 2015
10.6

2.1

—

3.3

9.4

 
 
 
Year ended December 31, 2014
18.1

3.9

—

11.4

10.6

 
 
WPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$11.4


$1.8


$—


$5.1


$8.1

 
 
 
Year ended December 31, 2015
16.3

0.7

—

5.6

11.4

 
 
 
Year ended December 31, 2014
16.2

2.5

—

2.4

16.3


(a)
Accumulated provision for uncollectible accounts: In accordance with its regulatory treatment, certain amounts provided by WPL are recorded in regulatory assets. WPL expenses these amounts when an uncollectible account is written-off.
(b)
Deductions are of the nature for which the reserves were created. In the case of the accumulated provision for uncollectible accounts, deductions from this reserve are reduced by recoveries of amounts previously written off.
(c)
Refer to Note 5(b) for discussion of IPL’s sales of accounts receivable program.
(d)
Other reserves are largely related to injury and damage claims arising in the ordinary course of business.
WPL [Member]  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Accounts And Reserves
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
 
 
 
 
Additions
 
 
 
Balance,
Charged to
Charged to Other
 
Balance,
Description
January 1
Expense
Accounts (a)
Deductions (b)
December 31
 
(in millions)
Valuation and Qualifying Accounts Which are Deducted in the Balance Sheet From the Assets to Which They Apply:
 
Accumulated Provision for Uncollectible Accounts:
 
 
 
 
 
 
Alliant Energy (c)
 
 
 
 
 
 
 
 
Year ended December 31, 2016

$4.8


$17.4


$8.8


$22.3


$8.7

 
 
 
Year ended December 31, 2015
5.1

8.1

3.0

11.4

4.8

 
 
 
Year ended December 31, 2014
4.8

11.7

4.1

15.5

5.1

 
 
IPL (c)
 
 
 
 
 
 
 
Year ended December 31, 2016

$0.6


$17.2


$—


$16.7


$1.1

 
 
 
Year ended December 31, 2015
0.4

8.1

—

7.9

0.6

 
 
 
Year ended December 31, 2014
0.7

11.5

—

11.8

0.4

 
 
WPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$3.7


$0.1


$8.8


$5.5


$7.1

 
 
 
Year ended December 31, 2015
4.2

—

3.0

3.5

3.7

 
 
 
Year ended December 31, 2014
1.7

—

4.1

1.6

4.2

Note: The above provisions relate to various customer, notes and other receivable balances included in various line items on the respective balance sheets.

Other Reserves:
 
Accumulated Provision for Other Reserves (d):
 
 
Alliant Energy
 
 
 
 
 
 
 
Year ended December 31, 2016

$27.1


$6.1


$—


$8.1


$25.1

 
 
 
Year ended December 31, 2015
32.6

6.5

—

12.0

27.1

 
 
 
Year ended December 31, 2014
38.2

12.5

—

18.1

32.6

 
 
IPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$9.4


$1.0


$—


$1.7


$8.7

 
 
 
Year ended December 31, 2015
10.6

2.1

—

3.3

9.4

 
 
 
Year ended December 31, 2014
18.1

3.9

—

11.4

10.6

 
 
WPL
 
 
 
 
 
 
 
Year ended December 31, 2016

$11.4


$1.8


$—


$5.1


$8.1

 
 
 
Year ended December 31, 2015
16.3

0.7

—

5.6

11.4

 
 
 
Year ended December 31, 2014
16.2

2.5

—

2.4

16.3


(a)
Accumulated provision for uncollectible accounts: In accordance with its regulatory treatment, certain amounts provided by WPL are recorded in regulatory assets. WPL expenses these amounts when an uncollectible account is written-off.
(b)
Deductions are of the nature for which the reserves were created. In the case of the accumulated provision for uncollectible accounts, deductions from this reserve are reduced by recoveries of amounts previously written off.
(c)
Refer to Note 5(b) for discussion of IPL’s sales of accounts receivable program.
(d)
Other reserves are largely related to injury and damage claims arising in the ordinary course of business.