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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reserve for materials and supplies      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 3.5 $ 7.2 $ 9.5
Charged to Costs and Expenses 2.9 1.7 2.6
Deductions (1.3) (5.4) (4.9)
Other(2) 0.0 0.0 0.0
Balance at End of Period 5.1 3.5 7.2
Tax valuation allowances      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 1,420.9 1,473.5 1,451.0
Charged to Costs and Expenses 16.4 (9.6) 0.6
Deductions 0.0 0.0 0.0
Other(2) 31.9 (43.0) 21.9
Balance at End of Period $ 1,469.2 $ 1,420.9 $ 1,473.5