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Significant Accounting Policies, Significant Accounting Policies, Airedale facility fire, Tooling Costs and Research and Development (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Unusual or Infrequent Item, or Both [Line Items]      
Gain within other income related to insurance settlement [1] $ 0.0 $ 0.0 $ 9.5
Research and development [Abstract]      
Research and development cost $ 65.8 64.4 61.1
Loss by Fire [Member]      
Unusual or Infrequent Item, or Both [Line Items]      
Gain within other income related to insurance settlement     $ 9.5
Tools [Member]      
Tooling [Abstract]      
Property, plant and equipment, depreciable lives 3 years    
Company-owned tooling, net $ 22.4 20.8  
Customer owned tooling receivable $ 10.7 $ 7.8  
[1] During fiscal 2016, the Company settled an insurance claim related to machinery and equipment destroyed in a fire at its Airedale facility and recorded a gain of $9.5 million. See Note 1 for additional information.