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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation        
Share-based compensation expenses capitalized as inventory $ 0.6 $ 0.9    
Defined benefit plans        
Net periodic benefit cost     $ 2.3 $ 2.3