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Reportable Segments - Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Assets    
Assets $ 2,452.6 $ 2,481.4
Operating Segments | Continuing Operations | D&S East    
Assets    
Assets 528.0 528.6
Operating Segments | Continuing Operations | D&S West    
Assets    
Assets 422.2 414.9
Operating Segments | Continuing Operations | E&C Cryogenics    
Assets    
Assets 437.8 430.3
Operating Segments | Continuing Operations | E&C FinFans    
Assets    
Assets 1,002.8 1,028.0
Corporate | Continuing Operations    
Assets    
Assets $ 61.8 $ 79.6