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Revenue - Contract Balances (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Capitalized Contract Cost [Line Items]    
Unbilled receivables $ 19.4 $ 31.3
Revenue recognized 157.7  
Other Noncurrent Assets    
Capitalized Contract Cost [Line Items]    
Unbilled receivables $ 8.3