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Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Consolidation principles [Abstract]      
Investments in non-consolidated affiliated companies 20.00%    
Shipping and handling costs [Abstract]      
Shipping and handling costs $ 2.5 $ 4.9 $ 4.0
Research and development [Abstract]      
Research and development cost 61.1 62.0 61.7
Short-term investments [Abstract]      
Short-term investments 3.3 2.8  
Trade accounts receivable [Abstract]      
Trade receivables, allowance for doubtful accounts 0.5 1.0  
Trade receivables sold without recourse 71.3 87.0 82.4
Loss on the sale of accounts receivables (0.3) (0.3) (0.3)
Goodwill impaired [Abstract]      
Goodwill impairment charges   (7.8)  
New accounting guidance [Abstract]      
Deferred income taxes 123.1 115.4  
Supplemental cash flow information [Abstract]      
Interest paid 10.7 10.3 12.6
Income taxes paid $ 10.1 15.9 $ 11.4
Tools [Member]      
Tooling [Abstract]      
Property, plant and equipment, depreciable lives 3 years    
Company-owned tooling, net $ 18.8 18.7  
Customer owned tooling receivable $ 8.5 11.6  
New Accounting Pronouncement, Early Adoption, Effect [Member]      
New accounting guidance [Abstract]      
Deferred income taxes   13.0  
Electronics Cooling Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Final payment on promissory note   1.5  
Gain on sale (Pre-tax)   0.9  
Gain on sale (After-tax)   $ 0.6