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Operations and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Cash, Cash Equivalents and Restricted Cash [Table Text Block]

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Balance Sheet that aggregate to the amounts presented in the Consolidated Statement of Cash Flows.

Cash, Cash Equivalents and Restricted Cash	March 31, 2019				December 31, 2018				March 31, 2018				December 31, 2017
Millions
Cash and Cash Equivalents		$353.3				$69.1				$98.5				$98.9
Restricted Cash included in Prepayments and Other	7.2				1.3				8.8				2.6
Restricted Cash included in Other Non-Current Assets	4.7				8.6				8.6				8.6
Cash, Cash Equivalents and Restricted Cash on the Consolidated Statement of Cash Flows		$365.2				$79.0				$115.9				$110.1

Inventories – Net [Table Text Block]

Inventories – Net	March 31, 2019				December 31, 2018
Millions
Fuel (a)		$29.4				$26.0
Materials and Supplies	44.4				44.2
Raw Materials (b)	—				2.8
Work in Progress (b)	—				6.1
Finished Goods (b)	—				8.4
Reserve for Obsolescence (b)	—				(0.8		)
Total Inventories – Net		$73.8				$86.7

(a) Fuel consists primarily of coal inventory at Minnesota Power.

(b) On March 26, 2019, ALLETE completed the sale of U.S. Water Services which resulted in the removal of the related inventory items from the Consolidated Balance Sheet.

Other Non-Current Assets [Table Text Block]

Other Non-Current Assets	March 31, 2019				December 31, 2018
Millions
Contract Assets (a)		$29.8				$30.7
Finance Receivable	10.4				10.4
Operating Lease Right-of-use Assets (b)	34.0				—
ALLETE Properties	24.0				24.4
Other	82.7				86.9
Total Other Non-Current Assets		$180.9				$152.4

(a) Contract Assets include payments made to customers as an incentive to execute or extend service agreements. The contract payments are being amortized over the term of the respective agreements as a reduction to revenue.

(b)

See Leases.

Other Current Liabilities [Table Text Block]

Other Current Liabilities	March 31, 2019				December 31, 2018
Millions
Provision for Interim Rate Refund (a)		$40.6				$40.0
PSAs	12.4				12.6
Contract Liabilities (b)	0.4				7.6
Provision for Tax Reform Refund (c)	0.5				10.7
Contingent Consideration (d)	—				3.8
Operating Lease Liabilities (e)	8.4				—
Other	36.2				53.8
Total Other Current Liabilities		$98.5				$128.5

(a) Provision for Interim Rate Refund is expected to be refunded to Minnesota Power’s regulated retail customers in the second quarter of 2019.

(b) Contract Liabilities include deposits received as a result of entering into contracts with our customers prior to completing our performance obligations.

(c) Provision for Tax Reform Refund related to the income tax benefits of the TCJA in 2018 was refunded to Minnesota Power customers in the first quarter of 2019 and will be refunded to SWL&P customers in 2019 and 2020.

(d) Contingent Consideration related to the earnings-based payment resulting from the U.S. Water Services acquisition was paid in the first quarter of 2019.

(e)

See Leases.

Other Non-Current Liabilities [Table Text Block]

Other Non-Current Liabilities	March 31, 2019				December 31, 2018
Millions
Asset Retirement Obligation		$142.0				$138.6
PSAs	73.9				76.9
Operating Lease Liabilities (a)	25.6				—
Other	46.4				47.1
Total Other Non-Current Liabilities		$287.9				$262.6

(a) See Leases.

Supplemental Statement of Cash Flows Information [Table Text Block]

Supplemental Statement of Cash Flows Information.

Three Months Ended March 31,	2019				2018
Millions
Cash Paid for Interest – Net of Amounts Capitalized		$19.7				$19.3
Noncash Investing and Financing Activities
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment	$(1.1)				$(48.1)
Reclassification of Property, Plant and Equipment to Inventory (a)	—					$46.9
Recognition of Right-of-use Assets and Lease Liabilities (b)	$34.0				—
Capitalized Asset Retirement Costs		$1.6				$0.8
AFUDC–Equity		$0.6				$0.3

(a) In February 2018, Montana-Dakota Utilities exercised its option to purchase the Thunder Spirit II wind energy facility upon completion, resulting in a reclassification from Property, Plant and Equipment – Net to Inventories – Net for project costs incurred in the prior year.

(b) See Leases.

Lease, Cost [Table Text Block]

The components of lease cost were as follows:

Three Months Ended March 31,		2019
Millions
Operating Lease Cost			$2.9
Other Information:
Operating Cash Flows From Operating Leases			$2.9
Balance Sheet Information Related to Leases:
Other Non-Current Assets			$34.0
Total Operating Lease Right-of-use Assets			$34.0
Other Current Liabilities			$8.4
Other Non-Current Liabilities		25.6
Total Operating Lease Liabilities			$34.0
Weighted Average Remaining Lease Term (Years):
Operating Leases - Vehicles and Equipment		4
Operating Leases - Land and Other		29
Weighted Average Discount Rate:
Operating Leases - Vehicles and Equipment		3.6		%
Operating Leases - Land and Other		4.5		%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of lease liabilities were as follows:

	March 31, 2019
Millions
2019		$9.9
2020	7.9
2021	6.1
2022	4.9
2023	3.1
Thereafter	9.4
Total Lease Payments Due	41.3
Less: Imputed Interest	7.3
Total Lease Obligations	34.0
Less: Current Lease Obligations	8.4
Long-term Lease Obligations		$25.6

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