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Acquisitions and Divestitures - Acquisition and divestiture activites - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquisitions:        
Purchase price   $ 63.0 $ 0.0 $ 46.2
Net cash paid   47.5 0.0 46.2
Goodwill recorded   25.0 0.0 0.0
Divestitures:        
Proceeds   0.0 0.0  
Gain recognized   0.0 0.0  
Goodwill charged off   $ 0.0 $ 0.0  
Construction Products Group | Texas, Mississippi, and Louisiana | Galvanizing Business        
Divestitures:        
Proceeds       51.3
Gain recognized $ 8.3     8.3
Goodwill charged off       $ 17.3