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Contract Assets and Liabilities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]        
Costs and estimated earnings in excess of billings $ 515.7   $ 515.7  
Capitalized contract costs amortized and recognized as expense 15.1 $ 14.7 47.0 $ 34.5
Revenue recognized $ 534.2 $ 439.8 $ 891.4 $ 663.6