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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