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Goodwill - Goodwill by segment (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill $ 752.7 [1] $ 621.9
Construction Products Group    
Goodwill [Line Items]    
Goodwill 294.1 166.2
Energy Equipment Group    
Goodwill [Line Items]    
Goodwill 419.8 416.9
Transportation Products Group    
Goodwill [Line Items]    
Goodwill $ 38.8 $ 38.8
[1] Unaudited