v3.26.1
Supplementary Financial Information - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash, Cash Equivalents, Restricted Cash, And Restricted Cash Equivalents [Roll Forward]    
Cash and cash equivalents, beginning of the year $ 48.8 $ 80.8
Restricted cash included in other current assets, beginning of period 0.0 0.9
Restricted cash included in other assets (non-current), beginning of period 0.5 0.6
Cash, cash equivalents and restricted cash, beginning of year 49.3 82.3
Cash and cash equivalents, end of the year 112.1 48.8
Restricted cash included in other current assets, end of period 0.0 0.0
Restricted cash included in other assets (non-current), end of period 0.6 0.5
Cash, cash equivalents and restricted cash, end of year 112.7 49.3
Total cash, cash equivalents and restricted cash 112.7 49.3
Supplemental cash flow information:    
Cash paid for interest 30.0 48.6
Cash paid for income taxes, net 6.4 3.5
Non-cash investing and financing activities:    
Accrued interest and fees capitalized into principal debt 66.3 6.6
Accrued dividends capitalized into principal debt 0.5 0.0
Exchange of preferred stock for debt 9.1 0.0
Property, plant and equipment included in accounts payable or accrued expenses $ 0.8 $ 0.5