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Business Segments (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Business Segments [Table Text Block]
Year Ended December 31
2017

2016

2015

Millions
 
 
 
Operating Revenue
 
 
 
Regulated Operations

$1,063.8


$1,000.7


$991.2

 
 
 
 
Energy Infrastructure and Related Services
 
 
 
ALLETE Clean Energy (a)
80.5

80.5

262.1

U.S. Water Services
151.8

137.5

119.8

 
 
 
 
Corporate and Other
123.2

121.0

113.3

Total Operating Revenue

$1,419.3


$1,339.7


$1,486.4

Net Income (Loss) Attributable to ALLETE (b)(c)
 
 
 
Regulated Operations

$128.4


$135.5


$131.6

 
 
 
 
Energy Infrastructure and Related Services
 
 
 
ALLETE Clean Energy
41.5

13.4

29.9

U.S. Water Services
10.7

1.5

0.9

 
 
 
 
Corporate and Other
(8.4
)
4.9

(21.3
)
Total Net Income Attributable to ALLETE

$172.2


$155.3


$141.1

Depreciation and Amortization
 
 
 
Regulated Operations

$132.6


$154.3


$135.1

 
 
 
 
Energy Infrastructure and Related Services
 
 
 
ALLETE Clean Energy
23.4

22.3

18.7

U.S. Water Services
9.8

8.9

7.3

 
 
 
 
Corporate and Other
11.7

10.3

8.9

Total Depreciation and Amortization

$177.5


$195.8


$170.0

Operating Expenses – Other (d)
 
 
 
ALLETE Clean Energy
—


$3.3

—

Corporate and Other
$(0.7)
(13.6
)
$36.3
Total Operating Expenses – Other
$(0.7)
$(10.3)
$36.3
Interest Expense (c)
 
 
 
Regulated Operations
$57.0
$52.1
$53.9
 
 
 
 
Energy Infrastructure and Related Services
 
 
 
ALLETE Clean Energy
4.2

5.8

3.3

U.S. Water Services
1.6

1.7

1.4

 
 
 
 
Corporate and Other
10.3

14.5

8.6

 
 
 
 
Eliminations
(5.3
)
(3.8
)
(2.3
)
Total Interest Expense
$67.8
$70.3
$64.9
Equity Earnings in ATC
 
 
 
Regulated Operations
$22.5
$18.5
$16.3
(a)
Includes the construction and sale of a wind energy facility by ALLETE Clean Energy to Montana-Dakota Utilities for $197.7 million in 2015.
(b)
Net income in 2017 included a favorable impact of $13.0 million after-tax due to the remeasurement of deferred income tax assets and liabilities resulting from the TCJA, which consisted of a $23.6 million after-tax benefit for ALLETE Clean Energy, a $9.2 million after-tax benefit for U.S. Water Services and a $19.8 million after-tax expense for Corporate and Other. The TCJA did not have an impact on net income for our Regulated Operations as the remeasurement of deferred income tax assets and liabilities primarily resulted in the recording of regulatory assets and liabilities. (See Note 1. Operations and Significant Accounting Policies, and Note 4. Regulatory Matters.)
(c)
Includes interest expense resulting from intercompany loan agreements and allocated to certain subsidiaries. The amounts are eliminated in consolidation. 
(d)
See Note 1. Operations and Significant Accounting Policies.
Year Ended December 31
2017

2016

2015

Millions
 
 
 
Income Tax Expense (Benefit) (a)
 
 
 
Regulated Operations (b)

$27.2


$5.9


$24.4

 
 
 
 
Energy Infrastructure and Related Services
 
 
 
ALLETE Clean Energy
(14.2
)
8.1

21.0

U.S. Water Services
(7.8
)
1.4

0.9

 
 
 
 
Corporate and Other (b)
9.5

4.4

(21.0
)
Total Income Tax Expense

$14.7


$19.8


$25.3


(a)
Income tax expense in 2017 included an income tax benefit of $13.0 million due to the remeasurement of deferred income tax assets and liabilities resulting from the TCJA, which consisted of income tax benefits of $23.6 million for ALLETE Clean Energy and $9.2 million for U.S. Water Services as well as additional income tax expense of $19.8 million for Corporate and Other. The TCJA did not have an impact on income tax expense for our Regulated Operations as the remeasurement of deferred income tax assets and liabilities primarily resulted in the recording of regulatory assets and liabilities. (See Note 1. Operations and Significant Accounting Policies, and Note 4. Regulatory Matters.)
(b)
In 2017, Regulated Operations includes $14.0 million of income tax expense related to North Dakota investment tax credits transferred to Corporate and Other and higher pre-tax income for the favorable impact for the regulatory outcome of the MPUC’s modification of its November 2016 order on the allocation of North Dakota investment tax credits. There was no impact to net income for Regulated Operations. Corporate and Other recorded an offsetting income tax benefit of $7.9 million in 2017. In 2016, Regulated Operations includes $15.0 million of income tax benefit for North Dakota investment tax credits transferred from Corporate and Other and lower pre-tax income related to the adverse impact for the regulatory outcome of the November 2016 MPUC order. There was no impact to net income for Regulated Operations. Corporate and Other recorded an offsetting income tax expense of $8.8 million in 2016. (See Note 4. Regulatory Matters.)
As of December 31
2017

2016

Millions
 
 
Assets
 
 
Regulated Operations (a)
$3,886.6
$3,823.9
 
 
 
Energy Infrastructure and Related Services
 
 
ALLETE Clean Energy
600.5

566.0

U.S. Water Services
292.4

264.1

 
 
 
Corporate and Other
300.5

222.9

Total Assets (a)

$5,080.0


$4,876.9

Capital Expenditures
 
 
Regulated Operations
$177.1
$121.8
 
 
 
Energy Infrastructure and Related Services
 
 
ALLETE Clean Energy
56.1

106.9

U.S. Water Services
4.4

3.7

 
 
 
Corporate and Other
28.9

15.4

Total Capital Expenditures

$266.5


$247.8


(a)
See Note 1. Operations and Significant Accounting Policies – Revision of Prior Balance Sheet.