Consolidated Statement of Income - USD ($)
shares in Millions, $ in Millions |
12 Months Ended |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Operating Revenue [Abstract] |
|
|
|
| Contracts with Customers – Utility |
$ 1,042.4
|
$ 1,059.5
|
$ 1,063.8
|
| Contracts with Customers – Non-utility |
186.5
|
415.5
|
331.9
|
| Other – Non-utility |
11.6
|
23.6
|
23.6
|
| Total Operating Revenue |
1,240.5
|
1,498.6
|
1,419.3
|
| Operating Expenses [Abstract] |
|
|
|
| Fuel, Purchased Power and Gas - Utility |
390.7
|
407.5
|
396.9
|
| Transmission Services - Utility |
69.8
|
69.9
|
71.2
|
| Cost of Sales - Non-utility |
80.6
|
218.0
|
147.5
|
| Operating and Maintenance |
264.3
|
340.5
|
344.1
|
| Depreciation and Amortization |
202.0
|
205.6
|
177.5
|
| Taxes Other Than Income Taxes |
53.3
|
57.9
|
56.9
|
| Operating Expenses – Other |
0.0
|
(2.0)
|
(0.7)
|
| Total Operating Expenses |
1,060.7
|
1,297.4
|
1,193.4
|
| Operating Income |
179.8
|
201.2
|
225.9
|
| Other Income (Expense) [Abstract] |
|
|
|
| Interest Expense |
(64.9)
|
(67.9)
|
(67.8)
|
| Equity Earnings |
21.7
|
17.5
|
22.5
|
| Gain on Sale of U.S. Water Services |
23.6
|
0.0
|
0.0
|
| Other |
18.7
|
7.8
|
6.3
|
| Total Other Expense |
(0.9)
|
(42.6)
|
(39.0)
|
| Income Before Non-Controlling Interest and Income Taxes |
178.9
|
158.6
|
186.9
|
| Income Tax Expense |
(6.6)
|
(15.5)
|
14.7
|
| Net Income |
185.5
|
174.1
|
172.2
|
| Less: Non-Controlling Interest in Subsidiaries |
(0.1)
|
0.0
|
0.0
|
| Net Income Attributable to ALLETE |
$ 185.6
|
$ 174.1
|
$ 172.2
|
| Average Shares of Common Stock and Per Share Data [Abstract] |
|
|
|
| Basic (Shares) |
51.6
|
51.3
|
50.8
|
| Diluted (Shares) |
51.7
|
51.5
|
51.0
|
| Basic Earnings Per Share of Common Stock |
$ 3.59
|
$ 3.39
|
$ 3.39
|
| Diluted Earnings Per Share of Common Stock |
$ 3.59
|
$ 3.38
|
$ 3.38
|