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Goodwill and Intangible Assets - Goodwill (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill  
Beginning Balance, Goodwill $ 459.7
Foreign currency translation adjustments (1.9)
Goodwill acquired during the year 4.7
Purchase price adjustment (5.3)
Ending Balance, Goodwill 457.2
Beginning Balance, Accumulated goodwill impairment loss 147.1
Foreign currency translation adjustments 0.0
Ending Balance, Accumulated goodwill impairment loss 147.1
Hudson  
Goodwill  
Purchase price adjustment (5.3)
Ending Balance, Goodwill 233.0
Energy & Chemicals  
Goodwill  
Beginning Balance, Goodwill 275.1
Foreign currency translation adjustments (1.2)
Goodwill acquired during the year 0.0
Purchase price adjustment (5.3)
Ending Balance, Goodwill 268.6
Beginning Balance, Accumulated goodwill impairment loss 64.6
Foreign currency translation adjustments 0.0
Ending Balance, Accumulated goodwill impairment loss 64.6
D&S West  
Goodwill  
Beginning Balance, Goodwill 147.3
Foreign currency translation adjustments (0.7)
Goodwill acquired during the year 4.7
Purchase price adjustment 0.0
Ending Balance, Goodwill 151.3
Beginning Balance, Accumulated goodwill impairment loss 82.5
Foreign currency translation adjustments 0.0
Ending Balance, Accumulated goodwill impairment loss 82.5
D&S East  
Goodwill  
Beginning Balance, Goodwill 37.3
Foreign currency translation adjustments 0.0
Goodwill acquired during the year 0.0
Purchase price adjustment 0.0
Ending Balance, Goodwill 37.3
Beginning Balance, Accumulated goodwill impairment loss 0.0
Foreign currency translation adjustments 0.0
Ending Balance, Accumulated goodwill impairment loss $ 0.0