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Accounts Receivable, net (Tables)
 9 Months Ended
Sep. 30, 2021
Receivables [Abstract]  
Schedule of Accounts Receivable Accounts receivables, net from contracts with customers consist of the following (in millions):
September 30,
2021		December 31,
2020
 
Accounts receivables with customers
Infrastructure
$405.4 $168.5 
Spectrum9.0 7.3 
Life Sciences0.2 — 
Total accounts receivables with customers$414.6 $175.8 
Accounts receivable, net consist of the following (in millions):
September 30,
2021		December 31,
2020
 
Contracts in progress$306.0 $118.6 
Unbilled retentions99.8 50.3 
Trade receivables9.3 7.5 
Other receivables10.5 8.9 
Allowance for doubtful accounts(0.6)(0.6)
Total$425.0 $184.7