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Long-term Employee Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer base salary based on age and service | $ 0.1 |  |
Curtailment gain | 2.0 | $ 11.0 |
Net gain (loss) | 35.0 | (4.0) | $ (2.0)
The accumulated benefit obligation for all pension plans | 356.0 | 396.0 |
Net periodic pension cost | 6.0 | 9.0 | 9.0
Employer contributions during period | 29.0 | 30.0 | 31.0
Defined Benefit Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated future employer contributions in next fiscal year | 6.0 |  |
Contributions by employer | 12.0 | 10.0 | 10.0
Defined Benefit Pension Plan [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Curtailment gain | 2.0 | 11.0 |
Net gain (loss) | 35.0 | (4.0) | (2.0)
Net periodic pension cost | 6.0 | 9.0 | 9.0
Defined benefit plan net actuarial gain | 9.0 | (26.0) |
Contributions by employer | 12.0 | 10.0 |
Defined Benefit Pension Plan [Member] | TAIWAN |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Mark to market loss |  |  | $ 1.0
Curtailment gain | 11.0 |  |
Amortization of net curtailment gain to net periodic pension cost | 1.0 | $ 1.0 |
Net gain (loss) | 9.0 |  |
Global Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan net actuarial gain | 9.0 |  |
Defined benefit plan gain partially offset by losses due to impact of inflation and salary scale assumptions | 2.0 |  |
Actuarial gain from increases in discount rates | 11.0 |  |
Defined benefit plan loss due to volatile equity and bond performance | $ 26.0 |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employees with guaranteed annual contribution ranging | 1.00% |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employees with guaranteed annual contribution ranging | 3.00% |  |
Chemours [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution percent of match | 100.00% |  |
Employer matching contribution percent of employees' gross pay | 6.00% |  |

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