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Goodwill and Intangibles, net - Changes in the Carrying Amount of Goodwill (Details)
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 171.7
Measurement period adjustment 7.1
Impairments (0.4)
Ending balance 178.4
Construction  
Goodwill [Roll Forward]  
Beginning balance 82.2
Measurement period adjustment 7.1
Impairments 0.0
Ending balance 89.3
Marine Services  
Goodwill [Roll Forward]  
Beginning balance 14.3
Measurement period adjustment 0.0
Impairments 0.0
Ending balance 14.3
Energy  
Goodwill [Roll Forward]  
Beginning balance 2.1
Measurement period adjustment 0.0
Impairments 0.0
Ending balance 2.1
Telecom  
Goodwill [Roll Forward]  
Beginning balance 4.4
Measurement period adjustment 0.0
Impairments (0.4)
Ending balance 4.0
Insurance  
Goodwill [Roll Forward]  
Beginning balance 47.3
Measurement period adjustment 0.0
Impairments 0.0
Ending balance 47.3
Broadcasting  
Goodwill [Roll Forward]  
Beginning balance 21.4
Measurement period adjustment 0.0
Impairments 0.0
Ending balance $ 21.4