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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%