v3.26.1
Financial Instruments and Fair Value Measurement - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2026
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2027
Dec. 31, 2025
Fair Value Disclosures [Abstract]          
Fair value of long-term debt   $ 5,506,000,000     $ 5,381,000,000
Carrying value of long-term debt   5,539,000,000     $ 5,434,000,000
Expected reclassification of pre-tax loss in the next twelve months from ACOL to earnings   $ 2,000,000      
Not Designated as Hedging Instrument | Maximum          
Derivatives not Designated as Hedges          
Foreign currency forward exchange contract term (in months)   3 months     3 months
Interest Rate Swap Agreements          
Foreign Currency Risk          
Notional amount   $ 500,000,000      
Derivatives not Designated as Hedges          
Notional amount   500,000,000      
Interest Rate Swap Agreements | Cash Flow Hedging | Designated as Hedging Instrument          
Interest Rate Risk          
Amounts excluded from effectiveness   0 $ 0    
Amounts excluded from the measure of effectiveness   0 0    
Commodity Risk          
Amounts excluded from effectiveness   0 0    
Amounts excluded from the measure of effectiveness   0 0    
Foreign Currency Risk          
Amounts excluded from effectiveness   0 0    
Amounts excluded from the measure of effectiveness   0 0    
Commodity Contracts | Cash Flow Hedging | Forecast          
Commodity Risk          
Percentage of expected natural gas usage hedged 60.00%     40.00%  
Commodity Contracts | Cash Flow Hedging | Designated as Hedging Instrument          
Interest Rate Risk          
Amounts excluded from effectiveness   0 0    
Amounts excluded from the measure of effectiveness   0 0    
Commodity Risk          
Amounts excluded from effectiveness   0 0    
Amounts excluded from the measure of effectiveness   0 0    
Foreign Currency Risk          
Amounts excluded from effectiveness   0 0    
Amounts excluded from the measure of effectiveness   0 $ 0    
Foreign Exchange Forward          
Foreign Currency Risk          
Notional amount   55,000,000     $ 118,000,000
Derivatives not Designated as Hedges          
Notional amount   55,000,000     118,000,000
Foreign Exchange Forward | Not Designated as Hedging Instrument          
Foreign Currency Risk          
Notional amount   184,000,000     155,000,000
Derivatives not Designated as Hedges          
Notional amount   184,000,000     $ 155,000,000
Foreign Exchange Forward | Cash Flow Hedging | Designated as Hedging Instrument          
Interest Rate Risk          
Amounts excluded from effectiveness   0      
Amounts excluded from the measure of effectiveness   0      
Commodity Risk          
Amounts excluded from effectiveness   0      
Amounts excluded from the measure of effectiveness   0      
Foreign Currency Risk          
Amounts reclassified into earnings connected to forecasted transactions no longer considered probable   0      
Amounts excluded from effectiveness   0      
Amounts excluded from the measure of effectiveness   $ 0