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Accounts Receivable, net (Tables)
 6 Months Ended
Jun. 30, 2021
Receivables [Abstract]  
Schedule of Accounts Receivable Accounts receivables, net from contracts with customers consist of the following (in millions):
June 30,
2021		December 31,
2020
 
Accounts receivables with customers
Infrastructure
$343.7 $168.5 
Spectrum8.5 7.3 
Life Sciences0.1 — 
Total accounts receivables with customers$352.3 $175.8 
Accounts receivable, net consist of the following (in millions):
June 30,
2021		December 31,
2020
 
Contracts in progress$250.5 $118.6 
Unbilled retentions93.8 50.3 
Trade receivables8.6 7.5 
Other receivables12.2 8.9 
Allowance for doubtful accounts(0.5)(0.6)
Total$364.6 $184.7