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Operations and Significant Accounting Policies - Supplemental Statement of Cash Flows Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Cash Paid During the Period for Interest – Net of Amounts Capitalized $ 75.1 $ 80.5 $ 72.8
Cash Paid for Income Taxes 19.1 19.5 6.0
Noncash Investing and Financing Activities      
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment 15.5 2.2 (9.6)
Reclassification of Property, Plant and Equipment to Inventory 0.0 0.0 99.7
Capitalized Asset Retirement Costs 55.0 5.8 11.8
AFUDC–Equity $ 5.0 $ 3.6 $ 2.7