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Operations and Significant Accounting Policies - Supplemental Statement of Cash Flow Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]      
Cash Paid During the Period for Interest – Net of Amounts Capitalized $ 72.8 $ 66.8 $ 62.0
Cash Paid (Received) for Income Taxes 6.0 0.0 (2.0)
Noncash Investing and Financing Activities [Abstract]      
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment (9.6) (14.0) (67.0)
Reclassification of Property, Plant and Equipment to Inventory [1] 99.7 0.0 0.0
Reclassification of Redeemable Non-Controlling Interest to Current Liabilities [2] 0.0 30.6 0.0
Capitalized Asset Retirement Costs 11.8 16.9 4.1
AFUDC–Equity $ 2.7 $ 2.6 $ 1.9
[1] The decommissioning of the existing Northern Wind assets resulted in a reclassification from Property, Plant and Equipment – Net to Inventories – Net in the second quarter of 2022 as they were repowered and subsequently sold to a subsidiary of Xcel Energy Inc. In the third quarter of 2022, safe harbor equipment was transferred to the project entity resulting in an additional reclassification from Property, Plant and Equipment – Net to Inventories – Net.
[2] Amount reclassified to Current Liabilities resulting from the exercise of an option to buy out a non-controlling interest.