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Pension and Savings Plans (Tables)
 12 Months Ended
Dec. 31, 2025
Pension and Savings Plans [Abstract]  
Schedule of fair value of assets by asset category and by fair value hierarchy
The following tables present the fair value of assets in the Master Trust by asset category and by fair value hierarchy:
 December 31, 2025
 Level 1Level 2Level 3Total
 (Dollars in millions)
Corporate bonds$— $60.3 $— $60.3 
U.S. government securities16.1 3.2 — 19.3 
Other6.1 2.4 — 8.5 
Total assets at fair value$22.2 $65.9 $— 88.1 
Assets measured at net asset value practical expedient (1)
Private mutual funds18.4 
Total plan assets$106.5 
 December 31, 2024
 Level 1Level 2Level 3Total
 (Dollars in millions)
Corporate bonds$— $65.3 $— $65.3 
U.S. government securities13.7 3.4 — 17.1 
Other4.3 1.9 — 6.2 
Total assets at fair value$18.0 $70.6 $— 88.6 
Assets measured at net asset value practical expedient (1)
Private mutual funds16.2 
Total plan assets$104.8 
(1)     In accordance with Accounting Standards Update 2015-07, investments that are measured at fair value using the net asset value per share practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the tables are intended to permit reconciliation of the fair value hierarchy to the total value of assets of the plans.