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Schedule I - Statements of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net income attributed to common shareholders | $ 194.4 | $ 217.0 | $ 181.4 | $ 346.2 | $ 179.3 | $ 182.5 | $ 80.9 | $ 195.8 | $ 939.0 | $ 638.5 | $ 588.3
Reconciliation to cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (146.5) | (96.1) | (66.0)
Deferred income taxes |  |  |  |  |  |  |  |  | 498.7 | 420.4 | 329.2
Change in - |  |  |  |  |  |  |  |  |  |  |
Other current assets |  |  |  |  |  |  |  |  | 103.1 | (27.2) | (13.9)
Other current liabilities |  |  |  |  |  |  |  |  | (20.8) | 14.1 | (45.3)
Other, net |  |  |  |  |  |  |  |  | (53.8) | (209.1) | (87.3)
Investing activities |  |  |  |  |  |  |  |  |  |  |
Purchase of subsidiary's common stock |  |  |  |  |  |  |  |  | (42.3) | (8.7) | (13.1)
Proceeds from the sale of assets and businesses |  |  |  |  |  |  |  |  | 166.3 | 28.9 | 13.9
Other, net |  |  |  |  |  |  |  |  | 3.0 | 57.0 | 3.6
Financing activities |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  |  |  |  |  |  |  |  | 41.6 | 30.1 | 50.3
Purchase of common stock |  |  |  |  |  |  |  |  | (108.0) | (74.7) | (123.2)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (624.9) | (455.4) | (352.0)
Issuance of long-term debt |  |  |  |  |  |  |  |  | 400.0 | 2,150.0 | 250.0
Other, net |  |  |  |  |  |  |  |  | (13.6) | (18.9) | 12.8
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  | (12.3) | (12.1) | 35.9
Cash and cash equivalents at beginning of year |  |  |  | 49.8 |  |  |  | 61.9 | 49.8 | 61.9 | 26.0
Cash and cash equivalents at end of year | 37.5 |  |  |  | 49.8 |  |  |  | 37.5 | 49.8 | 61.9
WEC Energy Group |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net income attributed to common shareholders |  |  |  |  |  |  |  |  | 939.0 | 638.5 | 588.3
Reconciliation to cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (996.5) | (695.7) | (635.0)
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 734.4 | 538.8 | 720.0
Deferred income taxes |  |  |  |  |  |  |  |  | 23.2 | 30.9 | 60.1
Change in - |  |  |  |  |  |  |  |  |  |  |
Prepaid taxes |  |  |  |  |  |  |  |  | (47.6) | 0.0 | 0.0
Other current assets |  |  |  |  |  |  |  |  | 13.0 | (9.3) | (0.3)
Accrued taxes |  |  |  |  |  |  |  |  | (75.6) | 175.7 | 4.1
Other current liabilities |  |  |  |  |  |  |  |  | (5.6) | (3.2) | 5.1
Other, net |  |  |  |  |  |  |  |  | 6.3 | (18.4) | (8.1)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 590.6 | 657.3 | 734.2
Investing activities |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  | 0.0 | (1,486.2) | 0.0
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  | (55.8) | (135.3) | (225.5)
Short-term notes receivable from related parties, net |  |  |  |  |  |  |  |  | 46.8 | (91.0) | 0.0
Purchase of subsidiary's common stock |  |  |  |  |  |  |  |  | (66.4) | 0.0 | 0.0
Proceeds from the sale of assets and businesses |  |  |  |  |  |  |  |  | 0.0 | 20.8 | 0.0
Other, net |  |  |  |  |  |  |  |  | (0.4) | (0.1) | 5.0
Net cash used in investing activities |  |  |  |  |  |  |  |  | (75.8) | (1,691.8) | (220.5)
Financing activities |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options |  |  |  |  |  |  |  |  | 41.6 | 30.1 | 50.3
Purchase of common stock |  |  |  |  |  |  |  |  | (108.0) | (74.7) | (123.2)
Dividends paid on common stock |  |  |  |  |  |  |  |  | (624.9) | (455.4) | (352.0)
Issuance of long-term debt |  |  |  |  |  |  |  |  | 0.0 | 1,200.0 | 0.0
Change in short-term debt |  |  |  |  |  |  |  |  | 13.9 | 307.9 | (72.0)
Short-term notes payable to related parties, net |  |  |  |  |  |  |  |  | 162.3 | 1.8 | 3.5
Other, net |  |  |  |  |  |  |  |  | 0.2 | (11.2) | 16.7
Net cash (used in) provided by financing activities |  |  |  |  |  |  |  |  | (514.9) | 998.5 | (476.7)
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  | (0.1) | (36.0) | 37.0
Cash and cash equivalents at beginning of year |  |  |  | $ 1.3 |  |  |  | $ 37.3 | 1.3 | 37.3 | 0.3
Cash and cash equivalents at end of year | $ 1.2 |  |  |  | $ 1.3 |  |  |  | $ 1.2 | $ 1.3 | $ 37.3

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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition Dividends received on equity and other investments during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + References No definition available. + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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