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Leases (Tables)
12 Months Ended
Dec. 31, 2015
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2015, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
 
Total
Alliant Energy

$6

 

$8

 

$3

 

$2

 

$2

 

$19

 

$40

IPL
3

 
3

 
2

 
1

 
1

 
13

 
23

WPL
3

 
5

 
1

 

 

 

 
9

IPL [Member]  
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2015, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
 
Total
Alliant Energy

$6

 

$8

 

$3

 

$2

 

$2

 

$19

 

$40

IPL
3

 
3

 
2

 
1

 
1

 
13

 
23

WPL
3

 
5

 
1

 

 

 

 
9

WPL [Member]  
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2015, future minimum operating lease payments, excluding contingent rentals, were as follows (in millions):
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
 
Total
Alliant Energy

$6

 

$8

 

$3

 

$2

 

$2

 

$19

 

$40

IPL
3

 
3

 
2

 
1

 
1

 
13

 
23

WPL
3

 
5

 
1

 

 

 

 
9

WPL [Member] | Sheboygan Falls Energy Facility [Member]  
Schedule of Capital Lease Expense
Sheboygan Falls lease expenses were included in WPL’s income statements as follows (in millions):
 
2015
 
2014
 
2013
Interest expense

$9.9

 

$10.4

 

$10.9

Depreciation and amortization
6.2

 
6.2

 
6.2

 

$16.1

 

$16.6

 

$17.1



Schedule of Future Minimum Lease Payments for Capital Leases
At December 31, 2015, WPL’s estimated future minimum capital lease payments for Sheboygan Falls were as follows (in millions):
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
 
Total
 
Less: amount representing interest
 
Present value of minimum capital lease payments
Sheboygan Falls
$15
 
$15
 
$15
 
$15
 
$15
 
$68
 
$143
 
$54
 
$89