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Long-Term Debt Summary and Future Principal Payments (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 19, 2019 | May 31, 2017
Long-Term Debt |  |  |  |
Total debt | $ 364.6 | $ 498.7 |  |
Unamortized debt issuance costs/discounts | (7.6) | (4.7) |  |
Current portion of long-term debt | (154.6) | (288.7) |  |
Long-term debt | $ 202.4 | $ 205.3 |  |
Weighted average interest rate on variable rate debt (as a percent) | 8.78% | 6.54% |  |
Future Principal Payments |  |  |  |
2024 | $ 154.6 |  |  |
2025 | 210.0 |  |  |
2026 | 0.0 |  |  |
2027 | 0.0 |  |  |
2028 | 0.0 |  |  |
Thereafter | 0.0 |  |  |
Total | 364.6 |  |  |
Senior Notes [Member] |  |  |  |
Long-Term Debt |  |  |  |
Total debt | $ 210.0 | $ 350.0 |  |
Senior notes stated interest rate | 5.125% |  |  | 5.125%
Revolving credit facility | Debt Instrument Adjusted Term SOFR |  |  |  |
Long-Term Debt |  |  |  |
Variable rate basis | Adjusted Term SOFR |  |  |
Interest rate basis (as a percent) | 2.25% |  |  |
Previous Revolving Credit Facility | Adjusted LIBOR |  |  |  |
Long-Term Debt |  |  |  |
Variable rate basis | Adjusted LIBOR |  |  |
Interest rate basis (as a percent) | 1.75% |  |  |
Credit Agreement | Revolving credit facility |  |  |  |
Long-Term Debt |  |  |  |
Total debt | $ 137.0 | 0.0 |  |
Previous Credit Agreement | Term Loan B-6 |  |  |  |
Long-Term Debt |  |  |  |
Total debt |  |  | $ 950.0 |
Previous Credit Agreement | Previous Revolving Credit Facility |  |  |  |
Long-Term Debt |  |  |  |
Total debt | 0.0 | 145.0 |  |
European Line of Credit | Foreign line of credit |  |  |  |
Long-Term Debt |  |  |  |
Total debt | $ 17.6 | $ 3.7 |  |
European Line of Credit | Foreign line of credit | Euribor rate |  |  |  |
Long-Term Debt |  |  |  |
Variable rate basis | Euribor |  |  |
Interest rate basis (as a percent) | 1.25% |  |  |

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