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Accounting Standards and Significant Accounting Policies (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle    
Accounts receivable, net $ 610.2 $ 535.0
Allowance for losses 12.5 12.1
Unbilled Revenues    
New Accounting Pronouncements or Change in Accounting Principle    
Accounts receivable, net 134.5 140.3
Unbilled Revenues | Retention Receivable    
New Accounting Pronouncements or Change in Accounting Principle    
Accounts receivable, net $ 7.9 $ 7.7