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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 01, 2018
Jun. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
Net sales     $ 405.7 $ 343.8  
Canton Drop Forge          
Business Acquisition [Line Items]          
Purchase price $ 35.6        
Cash paid to acquire business $ 36.7        
Canton Drop Forge and Other Acquisitions          
Business Acquisition [Line Items]          
Sales from acquirees in current quarter     $ 31.0    
Canton Drop Forge          
Business Acquisition [Line Items]          
Net sales         $ 60.0
Scenario, Forecast | Canton Drop Forge          
Business Acquisition [Line Items]          
Purchase price   $ 35.6      
Post closing adjustments to provisional purchase price   $ 1.1