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Commitments and Contingencies (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Guarantee Obligations [Line Items]  
Additional bonding capacity $ 587.2
Facility Agreement | Powell (UK) Limited  
Guarantee Obligations [Line Items]  
Guarantee liability 3.1
Revolving credit facility 11.1
Amount of credit facility remaining borrowing capacity 8.0
Surety Bonds  
Guarantee Obligations [Line Items]  
Guarantee liability $ 162.8