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v3.8.0.1

Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities |  |  |
Net income | $ 1,204.9 | $ 940.2 | $ 640.3
Reconciliation to cash provided by operating activities |  |  |
Depreciation and amortization | 798.6 | 762.6 | 583.5
Deferred income taxes and investment tax credits, net | 271.7 | 493.8 | 418.7
Contributions and payments related to pension and OPEB plans | (120.5) | (28.7) | (121.0)
Equity income in transmission affiliate, net of distributions | (4.8) | (46.6) | (11.0)
Change in - |  |  |
Accounts receivable and unbilled revenues | (86.4) | (180.7) | 84.0
Materials, supplies, and inventories | 49.3 | 100.0 | (69.4)
Other current assets | (6.0) | 103.1 | (27.2)
Accounts payable | 8.5 | 34.4 | (9.3)
Other current liabilities | 161.8 | (20.8) | 14.1
Other, net | (197.5) | (53.8) | (209.1)
Net cash provided by operating activities | 2,079.6 | 2,103.5 | 1,293.6
Investing Activities |  |  |
Capital expenditures | (1,959.5) | (1,423.7) | (1,266.2)
Integrys acquisition, net of cash acquired of $156.3 | 0.0 | 0.0 | (1,329.9)
Bluewater acquisition | (226.0) | 0.0 | 0.0
Cash acquired from business acquisition |  |  | 156.3
Capital contributions to transmission affiliates | (109.6) | (42.3) | (8.7)
Proceeds from the sale of assets and businesses | 24.0 | 166.3 | 28.9
Withdrawal of restricted cash from Rabbi trust for qualifying payments | 19.5 | 26.6 | 1.4
Other, net | 12.0 | 3.0 | 57.0
Net cash used in investing activities | (2,239.6) | (1,270.1) | (2,517.5)
Financing Activities |  |  |
Exercise of stock options | 30.8 | 41.6 | 30.1
Purchase of common stock | (71.3) | (108.0) | (74.7)
Dividends paid on common stock | (656.5) | (624.9) | (455.4)
Redemption of WPS preferred stock | 0.0 | 0.0 | (52.7)
Issuance of long-term debt | 435.0 | 400.0 | 2,150.0
Retirement of long-term debt | (154.5) | (306.0) | (529.6)
Change in short-term debt | 584.4 | (234.8) | 163.0
Other, net | (6.5) | (13.6) | (18.9)
Net cash provided by (used in) financing activities | 161.4 | (845.7) | 1,211.8
Net change in cash and cash equivalents | 1.4 | (12.3) | (12.1)
Cash and cash equivalents at beginning of year | 37.5 | 49.8 | 61.9
Cash and cash equivalents at end of year | $ 38.9 | $ 37.5 | $ 49.8

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- Definition The cash outflow for debt initially having maturity due after one year or beyond 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration