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Supplementary Financial Information - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 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 33.4 80.2
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 34.0 81.7
Total cash, cash equivalents and restricted cash 34.0 81.7
Supplemental cash flow information:    
Cash paid for interest 23.8 22.7
Cash paid for income taxes (proceeds from tax refunds), net 3.6 0.6
Non-cash investing and financing activities:    
Accrued interest capitalized into principal debt 2.5 4.3
Property, plant and equipment included in accounts payable or accrued expenses $ 0.7 $ 1.2