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Revenue and Contract Balances - Information About Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Revenue from Contract with Customer [Abstract]      
Accounts receivable $ 39.5 $ 43.6  
Contracts retention 7.3 8.6  
Allowances (credit losses and doubtful accounts) (3.3) (0.6) $ (0.3)
Accounts receivable and retention, net 43.5 51.6  
Costs and estimated earnings in excess of billings on uncompleted contracts 2.3 10.0  
Billings in excess of costs and estimated earnings on uncompleted contracts 8.5 7.9  
Variable consideration 62.0 62.0  
Other deferred revenue 4.9 5.6  
Revenue recognized related to contract liabilities $ 7.4 $ 4.7