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Supplementary Financial Information - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash, Cash Equivalents, Restricted Cash, And Restricted Cash Equivalents [Roll Forward]    
Cash and cash equivalents, beginning of the period $ 80.8 $ 80.4
Restricted cash included in other current assets, beginning of period 0.9 0.3
Restricted cash included in other assets (non-current), beginning of period 0.6 1.5
Cash, cash equivalents and restricted cash, beginning of period 82.3 82.2
Cash and cash equivalents, end of the period 38.4 16.6
Restricted cash included in other current assets, end of period 0.9 0.0
Restricted cash included in other assets (non-current), end of period 0.6 1.4
Cash, cash equivalents and restricted cash, end of period 39.9 18.0
Total cash, cash equivalents and restricted cash 39.9 18.0
Supplemental cash flow information:    
Cash paid for interest 19.6 19.5
(Proceeds from tax refunds) cash paid for income taxes, net (0.8) 5.0
Non-cash investing and financing activities:    
Accrued interest, exit fees and other fees capitalized into principal debt 3.3 0.0
Property, plant and equipment included in accounts payable or accrued expenses $ 0.9 $ 1.4