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v3.19.1

Operations and Significant Accounting Policies (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Cash, Cash Equivalents and Restricted Cash [Abstract] |  |  |  |  |
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
Total Cash, Cash Equivalents and Restricted Cash |  | 365.2 | 79.0 | $ 115.9 | $ 110.1
Inventories – Net [Abstract] |  |  |  |  |
Fuel | [1] | 29.4 | 26.0 |  |
Materials and Supplies |  | 44.4 | 44.2 |  |
Raw Materials (b) | [2] | 0.0 | 2.8 |  |
Work in Progress (b) | [2] | 0.0 | 6.1 |  |
Finished Goods (b) | [2] | 0.0 | 8.4 |  |
Reserve for Obsolescence (b) | [2] | 0.0 | (0.8) |  |
Total Inventories – Net |  | 73.8 | 86.7 |  |
Other Non-Current Assets [Abstract] |  |  |  |  |
Contract Assets | [3] | 29.8 | 30.7 |  |
Finance Receivable |  | 10.4 | 10.4 |  |
Operating Lease, Right-of-Use Asset | [4] | 34.0 | 0.0 |  |
ALLETE Properties |  | 24.0 | 24.4 |  |
Other |  | 82.7 | 86.9 |  |
Total Other Non-Current Assets |  | 180.9 | 152.4 |  |
Other Current Liabilites [Abstract] |  |  |  |  |
Provision for Interim Rate Refund | [5] | 40.6 | 40.0 |  |
PSAs |  | 12.4 | 12.6 |  |
Contract Liabilities | [6] | 0.4 | 7.6 |  |
Provision for Tax Reform Refunds | [7] | 0.5 | 10.7 |  |
Contingent Consideration | [8] | 0.0 | 3.8 |  |
Operating Lease Liabilities |  | 8.4 | 0.0 |  |
Other |  | 36.2 | 53.8 |  |
Total Other Current Liabilities |  | 98.5 | 128.5 |  |
Other Non-Current Liabilities [Abstract] |  |  |  |  |
Asset Retirement Obligation |  | 142.0 | 138.6 |  |
PSAs |  | 73.9 | 76.9 |  |
Operating Lease Liabilities |  | 25.6 | 0.0 |  |
Other |  | 46.4 | 47.1 |  |
Total Other Non-Current Liabilities |  | $ 287.9 | $ 262.6 |  |
[1] | Fuel consists primarily of coal inventory at Minnesota Power.
[2] | 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.
[3] | 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.
[4] | See Leases.
[5] | Provision for Interim Rate Refund is expected to be refunded to Minnesota Power’s regulated retail customers in the second quarter of 2019
[6] | Contract Liabilities include deposits received as a result of entering into contracts with our customers prior to completing our performance obligations.
[7] | 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.
[8] | Contingent Consideration related to the earnings-based payment resulting from the U.S. Water Services acquisition was paid in the first quarter of 2019.

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- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details
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- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 305 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84242212&loc=d3e2352-115587 + Details
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