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Valuation and Qualifying Accounts Schedule II (Tables)
 12 Months Ended
Dec. 31, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
DescriptionBalance at
Beginning of Period		Charged to
Costs and Expenses
Deductions(1)
Other(2)
 Balance
at End of Period
 (Dollars in millions)
Year Ended December 31, 2025
Reserves deducted from asset accounts:
Reserve for materials and supplies$3.5 $2.9 $(1.3)$— $5.1 
Tax valuation allowances1,420.9 16.4 — 31.9 1,469.2 
Year Ended December 31, 2024
Reserves deducted from asset accounts:  
Reserve for materials and supplies$7.2 $1.7 $(5.4)$— $3.5 
Tax valuation allowances1,473.5 (9.6)— (43.0)1,420.9 
Year Ended December 31, 2023
Reserves deducted from asset accounts:
Reserve for materials and supplies9.5 2.6 (4.9)— 7.2 
Tax valuation allowances1,451.0 0.6 — 21.9 1,473.5 
(1)Reserves utilized, unless otherwise indicated.
(2)Includes the impact of changes in the Australian dollar exchange rates.