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Supplementary Financial Information - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash, Cash Equivalents, Restricted Cash, And Restricted Cash Equivalents [Roll Forward]    
Cash and cash equivalents, beginning of the period $ 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 period 49.3 82.3
Cash and cash equivalents, end of the period 35.5 51.0
Restricted cash included in other current assets, end of period 0.0 0.9
Restricted cash included in other assets (non-current), end of period 0.6 0.6
Cash, cash equivalents and restricted cash, end of period 36.1 52.5
Total cash, cash equivalents and restricted cash 36.1 52.5
Supplemental cash flow information:    
Cash paid for interest 27.1 43.9
Cash paid for income taxes, net 4.6 2.5
Non-cash investing and financing activities:    
Accrued interest and fees capitalized into principal debt 63.1 5.4
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 $ 1.1 $ 0.6