v3.26.1
Defined Benefit Plans - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
benefitPlan
Dec. 31, 2024
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]            
Loss due to settlement   $ 7.0 $ 2.0 $ (13.0) $ (12.0) $ (3.0)
Employee benefit assets   1,684.0   1,467.0 1,684.0 $ 1,033.0
Settlement impact   $ 110.0        
Number of principal defined benefit plans | benefitPlan   2        
Plan obligation decrease due to Settlement     27.0 $ 263.0 $ 157.0  
Plan asset decrease     $ 27.0      
Increase in discount rate       0.10% 0.50%  
Expected contributions to defined benefit plans over the next fiscal year       $ 65.1    
United States of America            
Defined Benefit Plan Disclosure [Line Items]            
Loss due to settlement       9.0    
Employee benefit assets       $ 20.0    
Berry Global Group, Inc            
Defined Benefit Plan Disclosure [Line Items]            
Increase in net liability, defined benefit plan $ 123.0          
Decrease in liability, defined benefit plan $ (2.0)