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Non Operating Income and Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Income and Expenses [Abstract]                      
Interest Expense, Operating and Nonoperating                 $ (32.0) $ (11.8) $ (11.7)
Interest Costs Capitalized Adjustment                 1.6 0.3 0.1
Amortization of Debt Issuance Costs                 (1.7) (0.5) (0.6)
Interest Income, Other                 2.9 2.4 1.0
Interest expense, net $ (5.3) $ (13.1) $ (9.6) $ (1.2) $ (1.6) $ (2.2) $ (2.9) $ (2.8) (29.2) (9.5) (11.2)
Debt retirement costs $ (9.1) $ 0.0 $ 0.0 $ 0.0 $ (3.1) $ 0.0 $ 0.0 $ 0.0 $ (9.1) $ (3.1) $ (0.5)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]                 Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Nonoperating Income (Expense)                 $ (36.6) $ (12.5) $ (17.4)
Write off of Deferred Debt Issuance Cost                   0.4  
Redemption Premium                   $ 2.7