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Long-term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Carrying amount          
Debt Instrument [Line Items]          
Less: Unamortized debt issuance costs $ (6.6)   $ (6.6)   $ (8.1)
Total debt 338.5   338.5   334.2
Finance lease obligations 25.1   25.1   22.3
Total debt 338.5   338.5   334.2
Less: Current portion of long-term debt 14.8   14.8   13.5
Long-term debt 323.7   323.7   320.7
Interest expense, net of capitalized interest 9.7 $ 13.8 35.1 $ 45.5  
Interest Paid, Capitalized, Investing Activities 8.5 14.8 32.6 56.7  
Noncash interest expense, net 0.8 0.7 4.0 4.0  
Interest Costs Capitalized (2.7) 0.0 (4.4) 0.0  
Financial assurance instruments          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 5.8 8.9 20.7 28.9  
Indebtedness          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 2.6 2.6 7.8 7.8  
Capital Lease Obligations          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 0.4 0.4 1.3 1.4  
Amortization of debt issuance costs          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 0.6 0.7 4.0 2.9  
Other          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest 2.5 0.3 3.8 1.7  
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)          
Debt Instrument [Line Items]          
Long-term debt $ 320.0   $ 320.0   $ 320.0
Stated interest rate 3.25%   3.25%    
Secured debt | Accounts Receivable Securitization Program          
Debt Instrument [Line Items]          
Interest expense, net of capitalized interest $ 0.5 $ 0.9 $ 1.9 $ 2.8