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Goodwill
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
Goodwill by segment is as follows:
 
June 30,
2019
 
December 31,
2018
 
(in millions)
Construction Products Group
$
175.8

 
$
171.7

Energy Equipment Group
416.9

 
416.9

Transportation Products Group
38.7

 
26.6

 
$
631.4

 
$
615.2


The increase in the Construction Products Group goodwill during the six months ended June 30, 2019 is due to a refinement of the purchase price allocation for ACG. The increase in the Transportation Products Group goodwill during the six months ended June 30, 2019 is due to an acquisition. See Note 2 Acquisitions and Divestitures.