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v3.25.2

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Carrying amount |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Less: Unamortized debt issuance costs | $ (5.3) |  | $ (5.3) |  | $ (6.3)
Total debt | 343.8 |  | 343.8 |  | 348.1
BUMA Loan Note | 9.8 |  | 9.8 |  | 9.3
Finance lease obligations | 19.3 |  | 19.3 |  | 25.1
Total debt | 343.8 |  | 343.8 |  | 348.1
Less: Current portion of long-term debt | 14.6 |  | 14.6 |  | 15.8
Long-term debt | 329.2 |  | 329.2 |  | 332.3
Interest expense, net of capitalized interest | 11.1 | $ 10.7 | 22.6 | $ 25.4 |
Interest Paid, Capitalized, Investing Activity | 14.2 | 12.6 | 24.1 | 24.1 |
Noncash interest expense | 1.7 | 1.9 | 3.3 | 3.2 |
Interest Costs Capitalized | (1.7) | (1.7) | (3.9) | (1.7) |
Financial assurance instruments |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 6.4 | 6.1 | 13.6 | 14.9 |
Indebtedness |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 2.6 | 2.6 | 5.2 | 5.2 |
Capital Lease Obligations |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 0.3 | 0.5 | 0.7 | 0.9 |
Amortization of debt issuance costs |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 1.4 | 2.0 | 2.8 | 3.2 |
Other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 1.5 | 0.6 | 3.0 | 1.5 |
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 | $ 0.6 | $ 0.6 | $ 1.2 | $ 1.4 |

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