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v3.24.2.u1

Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Carrying amount |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Less: Unamortized debt issuance costs | $ (7.2) |  | $ (7.2) |  | $ (8.1)
Total debt | 337.3 |  | 337.3 |  | 334.2
Finance lease obligations | 24.5 |  | 24.5 |  | 22.3
Total debt | 337.3 |  | 337.3 |  | 334.2
Less: Current portion of long-term debt | 14.1 |  | 14.1 |  | 13.5
Long-term debt | 323.2 |  | 323.2 |  | 320.7
Interest expense, net of capitalized interest | 10.7 | $ 13.3 | 25.4 | $ 31.7 |
Interest Paid, Capitalized, Investing Activities | 12.6 | 22.9 | 24.1 | 41.9 |
Other Noncash Income (Expense) | 1.9 | 1.7 |  |  |
Noncash interest expense, net |  |  | 3.2 | 3.3 |
Interest Costs Capitalized | (1.7) | 0.0 | (1.7) | 0.0 |
Financial assurance instruments |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 6.1 | 8.0 | 14.9 | 20.0 |
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 | 0.5 | 0.4 | 0.9 | 0.9 |
Amortization of debt issuance costs |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 2.0 | 0.7 | 3.2 | 2.3 |
Other |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense, net of capitalized interest | 1.2 | $ 1.6 | 2.9 | $ 3.3 |
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% |  |

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