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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 199.8 $ 185.5
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 222.0 204.6
Deferred tax expense and tax credits 49.7 46.1
Other (10.5) (28.8)
Other changes in assets and liabilities:    
Accounts receivable 47.7 (59.5)
Sales of accounts receivable 22.0 133.0
Regulatory assets (66.7) 34.7
Regulatory liabilities (19.0) (29.2)
Deferred income taxes 60.9 46.2
Derivative liabilities 16.8 (27.5)
Other (20.7) 4.9
Net cash flows from operating activities 502.0 510.0
Cash flows used for investing activities:    
Utility business construction and acquisition expenditures (579.3) (491.0)
Alliant Energy Corporate Services, Inc. and non-regulated businesses construction and acquisition expenditures (28.2) (28.9)
Other (18.9) 19.1
Net cash flows used for investing activities (626.4) (500.8)
Cash flows from (used for) financing activities:    
Common stock dividends (143.1) (133.2)
Proceeds from issuance of common stock, net 137.3 13.8
Net change in commercial paper 164.5 127.8
Other (35.2) (16.9)
Net cash flows from (used for) financing activities 123.5 (8.5)
Net increase (decrease) in cash and cash equivalents (0.9) 0.7
Cash and cash equivalents at beginning of period 8.2 5.8
Cash and cash equivalents at end of period 7.3 6.5
Supplemental cash flows information:    
Interest, net of capitalized interest (105.0) (95.8)
Income taxes, net (11.4) (4.3)
Significant non-cash investing and financing activities:    
Accrued capital expenditures 124.3 122.1
IPL [Member]    
Cash flows from operating activities:    
Net income 85.1 82.6
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 114.8 105.1
Other 8.7 3.4
Other changes in assets and liabilities:    
Accounts receivable 27.2 (32.7)
Sales of accounts receivable 22.0 133.0
Regulatory assets (47.5) (2.8)
Regulatory liabilities (18.7) (30.2)
Accrued taxes 12.2 (14.5)
Deferred income taxes 54.2 44.0
Other 10.0 (16.1)
Net cash flows from operating activities 268.0 271.8
Cash flows used for investing activities:    
Utility business construction and acquisition expenditures (290.2) (298.4)
Other (15.7) 6.9
Net cash flows used for investing activities (305.9) (291.5)
Cash flows from (used for) financing activities:    
Common stock dividends (78.0) (76.1)
Capital contributions from parent 100.0 40.0
Net change in commercial paper 40.0 67.0
Other (23.4) (13.3)
Net cash flows from (used for) financing activities 38.6 17.6
Net increase (decrease) in cash and cash equivalents 0.7 (2.1)
Cash and cash equivalents at beginning of period 3.3 4.5
Cash and cash equivalents at end of period 4.0 2.4
Supplemental cash flows information:    
Interest, net of capitalized interest (55.7) (49.8)
Income taxes, net 11.9 (12.9)
Significant non-cash investing and financing activities:    
Accrued capital expenditures 43.2 52.1
WPL [Member]    
Cash flows from operating activities:    
Net income 83.6 90.7
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 105.2 94.8
Deferred tax expense and tax credits 25.2 42.0
Other 4.0 (15.7)
Other changes in assets and liabilities:    
Accounts receivable 32.2 (5.2)
Regulatory assets (19.2) 37.5
Derivative liabilities 8.8 (13.9)
Other (9.9) 21.2
Net cash flows from operating activities 229.9 251.4
Cash flows used for investing activities:    
Utility business construction and acquisition expenditures (307.0) (192.6)
Other (15.4) (13.0)
Net cash flows used for investing activities (322.4) (205.6)
Cash flows from (used for) financing activities:    
Common stock dividends (63.0) (67.5)
Net change in commercial paper 160.2 25.9
Other (6.1) (1.5)
Net cash flows from (used for) financing activities 91.1 (43.1)
Net increase (decrease) in cash and cash equivalents (1.4) 2.7
Cash and cash equivalents at beginning of period 4.2 0.4
Cash and cash equivalents at end of period 2.8 3.1
Supplemental cash flows information:    
Interest, net of capitalized interest (45.9) (45.7)
Income taxes, net (19.3) 3.0
Significant non-cash investing and financing activities:    
Accrued capital expenditures $ 76.6 $ 62.7