v3.26.1
Long-term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Carrying amount      
Debt Instrument [Line Items]      
Less: Unamortized debt issuance costs $ (3.9)   $ (4.4)
Total debt 335.2   336.4
Finance lease obligations 19.1   20.8
Total debt 335.2   336.4
Less: Current portion of long-term debt 14.3   15.2
Long-term debt 320.9   321.2
Interest expense, net of capitalized interest 10.7 $ 11.5  
Interest Paid, Capitalized, Investing Activity 9.9 9.9  
Noncash interest expense, net 1.4 1.6  
Interest Costs Capitalized (2.1) (2.2)  
Finance lease obligations      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 0.3 0.4  
Financial assurance instruments      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 6.7 7.2  
Indebtedness      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 2.6 2.6  
Amortization of debt issuance costs      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 1.4 1.4  
Other      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest 1.2 1.5  
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)      
Debt Instrument [Line Items]      
2028 Convertible Notes $ 320.0   $ 320.0
Stated interest rate 3.25%    
Secured debt | Accounts Receivable Securitization Program      
Debt Instrument [Line Items]      
Interest expense, net of capitalized interest $ 0.6 $ 0.6