v3.26.3
Debt - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Mar. 31, 2031
Jun. 30, 2026
Mar. 31, 2026
Mar. 31, 2025
Jun. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Debt Instrument [Line Items]                
Other expenses     $ 0.3          
DebtInstrument Unused Borrowing Capacity Description     Borrowings under the Facility bear interest, at Hexcel’s option, for SOFR rate borrowings at (i) an Adjusted Term SOFR rate (subject to a 0.00% floor), where such “Adjusted Term SOFR” rate is equal to the Term SOFR rate for the applicable interest period, plus the Applicable Margin or (ii) for base rate borrowings, the greatest of (a) the prime rate, (b) the federal funds rate plus 0.50% and (c) the Adjusted Term SOFR rate (subject to a 0.00% floor) for a one-month interest period plus 1.00%, in each case plus the Applicable Margin. The “Applicable Margin” initially was 1.125% for SOFR rate borrowings and 0.125% for base rate borrowings. After the date the Agent received a compliance certificate for the fiscal quarter ended March 31, 2026, the Applicable Margin can fluctuate, determined by reference to the more favorable to Hexcel of its (x) public debt rating and (y) consolidated leverage ratio, as specified in the Credit Agreement. Up to $50 million of the Facility may be used for letters of credit. The Credit Agreement enables Hexcel, from time to time, to add term loans or to increase the revolving credit commitment in an aggregate amount not to exceed $500 million.          
Base rate borrowings     0.125%          
Debt Extinguishment costs           $ 0.7 $ 0.4  
federal fund rate plus     0.50%          
Borrowings           934.9   $ 993.0
SOFR rate borrowings     1.125%          
SOFR                
Debt Instrument [Line Items]                
One-month interest period plus     1.00%          
Maximum                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 1.9          
Maximum | Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity     500.0          
5.875% senior unsecured notes due 2035                
Debt Instrument [Line Items]                
Financing fees           3.9    
Face value       $ 300.0   $ 300.0    
Debt instrument, interest rate       5.875%   5.875%    
Increase in senior notes interest rate       0.25%        
Effective interest rate           6.00%    
Fair value of senior unsecured notes           $ 289.8    
5.875% senior unsecured notes due 2035 | Treasury Lock | Interest Lock Agreement                
Debt Instrument [Line Items]                
Percentage of effective interest rate benefit           0.10%    
5.875% senior unsecured notes due 2035 | Minimum                
Debt Instrument [Line Items]                
Debt instrument, interest rate       7.875%        
5.875% senior unsecured notes due 2025                
Debt Instrument [Line Items]                
Repayment of senior unsecured credit facility           $ (0.4)    
3.95% senior unsecured notes due 2027                
Debt Instrument [Line Items]                
Face value           $ 400.0    
Debt instrument, interest rate           3.95%    
Debt instrument, maturity year           2027    
4.7% senior unsecured notes due 2025                
Debt Instrument [Line Items]                
Debt instrument, interest rate           4.70%    
Debt instrument, maturity year           2025    
Senior Unsecured Revolving Credit Facility 2031                
Debt Instrument [Line Items]                
Maximum borrowing capacity     750.0          
Debt instrument expiration period Mar. 31, 2031              
Senior Unsecured Revolving Credit Facility 2031 | Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 50.0          
Senior unsecured credit facility                
Debt Instrument [Line Items]                
Borrowings           $ 240.0   $ 295.0
Letters of credit issued under credit facility           0.0    
Undrawn availability under credit facility           $ 510.0    
Weighted average interest rate           4.79%    
4.9% senior unsecured notes due 2031                
Debt Instrument [Line Items]                
Financing fees         $ 3.9      
Face value   $ 400.0     $ 400.0      
Debt instrument, interest rate   4.90%     4.90%      
Debt instrument, maturity year   2031            
Increase in senior notes interest rate         0.25%      
Effective interest rate   5.10%     5.10%      
Fair value of senior unsecured notes   $ 384.2     $ 384.2      
4.9% senior unsecured notes due 2031 | Maximum                
Debt Instrument [Line Items]                
Debt instrument, interest rate   6.90%     6.90%      
4.9% senior unsecured notes due 2027                
Debt Instrument [Line Items]                
Face value           $ 400.0    
Debt instrument, interest rate           4.90%    
Repayment of senior unsecured credit facility           $ (0.7)