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Reportable Segments - Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Assets    
Assets $ 2,497.8 $ 1,897.7
Operating Segments | Continuing Operations | E&C Cryogenics    
Assets    
Assets 447.1 455.0
Operating Segments | Continuing Operations | E&C FinFans    
Assets    
Assets 1,045.6 434.2
Operating Segments | Continuing Operations | D&S West    
Assets    
Assets 441.4 420.3
Operating Segments | Continuing Operations | D&S East    
Assets    
Assets 497.2 496.1
Corporate | Continuing Operations    
Assets    
Assets $ 66.5 $ 92.1