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Accounts Receivable, Net - Accounts Receivable, net (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jan. 01, 2023
Receivables [Abstract]      
Contracts in progress $ 171.0 $ 271.7  
Trade receivables 2.3 1.9  
Other receivables 5.0 5.2  
Allowance for expected credit losses (0.1) (0.4)  
Total $ 178.2 $ 278.4 $ 254.9