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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 103.0 $ 99.1
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 107.0 102.5
Deferred tax expense and tax credits 22.7 22.8
Other (7.6) (17.6)
Other changes in assets and liabilities:    
Accounts receivable 36.5 (47.8)
Sales of accounts receivable 35.0 57.0
Gas stored underground 25.4 27.4
Regulatory assets (40.6) (9.5)
Derivative assets 28.1 10.7
Accounts payable (41.3) (31.2)
Regulatory liabilities 14.2 (28.7)
Deferred income taxes 32.8 20.3
Other 18.5 23.3
Net cash flows from operating activities 333.7 228.3
Cash flows used for investing activities:    
Utility business construction and acquisition expenditures (276.4) (220.4)
Alliant Energy Corporate Services, Inc. and non-regulated businesses construction and acquisition expenditures (15.1) (18.8)
Other (12.1) 19.2
Net cash flows used for investing activities (303.6) (220.0)
Cash flows from (used for) financing activities:    
Common stock dividends (71.5) (66.5)
Net change in commercial paper 58.7 53.6
Other (17.1) 3.6
Net cash flows from (used for) financing activities (29.9) (9.3)
Net increase (decrease) in cash and cash equivalents 0.2 (1.0)
Cash and cash equivalents at beginning of period 8.2 5.8
Cash and cash equivalents at end of period 8.4 4.8
Supplemental cash flows information:    
Interest, net of capitalized interest (51.8) (44.5)
Income taxes, net (2.3) 0.0
Significant non-cash investing and financing activities:    
Accrued capital expenditures 139.3 105.0
IPL [Member]    
Cash flows from operating activities:    
Net income 39.8 48.2
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 53.6 52.7
Other 3.1 3.2
Other changes in assets and liabilities:    
Accounts receivable 32.7 (37.5)
Sales of accounts receivable 35.0 57.0
Regulatory assets (29.3) (3.8)
Accounts payable (24.7) (19.5)
Regulatory liabilities 15.7 (23.6)
Deferred income taxes 29.1 20.9
Other 21.3 18.8
Net cash flows from operating activities 176.3 116.4
Cash flows used for investing activities:    
Utility business construction and acquisition expenditures (127.6) (135.3)
Other (8.7) 12.1
Net cash flows used for investing activities (136.3) (123.2)
Cash flows from (used for) financing activities:    
Common stock dividends (39.1) (38.1)
Capital contributions from parent 0.0 40.0
Other (0.1) 3.4
Net cash flows from (used for) financing activities (39.2) 5.3
Net increase (decrease) in cash and cash equivalents 0.8 (1.5)
Cash and cash equivalents at beginning of period 3.3 4.5
Cash and cash equivalents at end of period 4.1 3.0
Supplemental cash flows information:    
Interest, net of capitalized interest (28.4) (22.6)
Income taxes, net (2.6) 1.1
Significant non-cash investing and financing activities:    
Accrued capital expenditures 44.2 47.6
WPL [Member]    
Cash flows from operating activities:    
Net income 45.5 47.0
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 52.4 47.4
Deferred tax expense and tax credits 11.8 18.8
Other 2.6 (10.9)
Other changes in assets and liabilities:    
Accounts receivable 13.3 (8.9)
Derivative assets 16.1 1.0
Accounts payable (25.5) (15.3)
Derivative liabilities 8.7 19.5
Other 20.7 25.0
Net cash flows from operating activities 145.6 123.6
Cash flows used for investing activities:    
Utility business construction and acquisition expenditures (141.3) (85.1)
Other (8.0) (6.3)
Net cash flows used for investing activities (149.3) (91.4)
Cash flows from (used for) financing activities:    
Common stock dividends (31.5) (33.8)
Net change in commercial paper 38.9 5.6
Other (5.8) (3.1)
Net cash flows from (used for) financing activities 1.6 (31.3)
Net increase (decrease) in cash and cash equivalents (2.1) 0.9
Cash and cash equivalents at beginning of period 4.2 0.4
Cash and cash equivalents at end of period 2.1 1.3
Supplemental cash flows information:    
Interest, net of capitalized interest (21.9) (21.9)
Income taxes, net 0.0 (7.4)
Significant non-cash investing and financing activities:    
Accrued capital expenditures $ 90.5 $ 49.7