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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule II - Valuation and Qualifying Accounts [Roll Forward]      
Balance at Beginning of Period $ 148.2 $ 158.5 $ 213.0
Charges to Cost and Expense 16.1 28.1 49.5
Other Additions 0.0 0.0 0.0
(Deductions) (45.2) (38.4) (104.0)
Balance at End of Period 119.1 148.2 158.5
Allowance for credit losses      
Schedule II - Valuation and Qualifying Accounts [Roll Forward]      
Balance at Beginning of Period 19.1 15.1 8.4
Charges to Cost and Expense 2.4 9.9 12.7
Other Additions 0.0 0.0 0.0
(Deductions) (3.6) (5.9) (6.0)
Balance at End of Period 17.9 19.1 15.1
Allowance for unbilled receivables and project close-out liabilities      
Schedule II - Valuation and Qualifying Accounts [Roll Forward]      
Balance at Beginning of Period 64.4 83.0 117.0
Charges to Cost and Expense 8.5 8.6 34.0
Other Additions 0.0 0.0 0.0
(Deductions) (32.7) (27.2) (68.0)
Balance at End of Period 40.2 64.4 83.0
Valuation allowance for deferred tax assets      
Schedule II - Valuation and Qualifying Accounts [Roll Forward]      
Balance at Beginning of Period 64.7 60.4 87.6
Charges to Cost and Expense 5.2 9.6 2.8
Other Additions 0.0 0.0 0.0
(Deductions) (8.9) (5.3) (30.0)
Balance at End of Period $ 61.0 $ 64.7 $ 60.4