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Goodwill - Goodwill by segment (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill $ 631.4 [1] $ 615.2
Construction Products Group    
Goodwill [Line Items]    
Goodwill 175.8 171.7
Energy Equipment Group    
Goodwill [Line Items]    
Goodwill 416.9 416.9
Transportation Products Group    
Goodwill [Line Items]    
Goodwill $ 38.7 $ 26.6
[1] Unaudited