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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Goodwill [Line Items]    
Gross goodwill, beginning of the period $ 62.7 $ 64.9
Accumulated impairments, beginning of the period (32.8) (33.4)
Net goodwill balance, beginning of the period 29.9 31.5
Gross goodwill, Fluctuations in foreign currency (2.3) (2.2)
Accumulated impairments, Fluctuations in foreign currency 0.3 0.6
Net goodwill balance, Fluctuations in foreign currency (2.0) (1.6)
Gross goodwill, Acquisition 0.8  
Accumulated impairments, Acquisition 0  
Net goodwill balance, Acquisition 0.8  
Gross goodwill, ending of the period 61.2 62.7
Accumulated impairments, ending of the period (32.5) (32.8)
Net goodwill balance, ending of the period 28.7 29.9
Asia [Member]
    
Goodwill [Line Items]    
Gross goodwill, beginning of the period 0.5 0.5
Accumulated impairments, beginning of the period 0 0
Net goodwill balance, beginning of the period 0.5 0.5
Gross goodwill, Fluctuations in foreign currency 0 0
Accumulated impairments, Fluctuations in foreign currency 0 0
Net goodwill balance, Fluctuations in foreign currency 0 0
Gross goodwill, Acquisition 0  
Accumulated impairments, Acquisition 0  
Net goodwill balance, Acquisition 0  
Gross goodwill, ending of the period 0.5 0.5
Accumulated impairments, ending of the period 0 0
Net goodwill balance, ending of the period 0.5 0.5
Europe [Member]
    
Goodwill [Line Items]    
Gross goodwill, beginning of the period 9.0 9.6
Accumulated impairments, beginning of the period (9.0) (9.6)
Net goodwill balance, beginning of the period 0 0
Gross goodwill, Fluctuations in foreign currency (0.3) (0.6)
Accumulated impairments, Fluctuations in foreign currency 0.3 0.6
Net goodwill balance, Fluctuations in foreign currency 0 0
Gross goodwill, Acquisition 0  
Accumulated impairments, Acquisition 0  
Net goodwill balance, Acquisition 0  
Gross goodwill, ending of the period 8.7 9.0
Accumulated impairments, ending of the period (8.7) (9.0)
Net goodwill balance, ending of the period 0 0
North America [Member]
    
Goodwill [Line Items]    
Gross goodwill, beginning of the period 23.8 23.8
Accumulated impairments, beginning of the period (23.8) (23.8)
Net goodwill balance, beginning of the period 0 0
Gross goodwill, Fluctuations in foreign currency 0 0
Accumulated impairments, Fluctuations in foreign currency 0 0
Net goodwill balance, Fluctuations in foreign currency 0 0
Gross goodwill, Acquisition 0  
Accumulated impairments, Acquisition 0  
Net goodwill balance, Acquisition 0  
Gross goodwill, ending of the period 23.8 23.8
Accumulated impairments, ending of the period (23.8) (23.8)
Net goodwill balance, ending of the period 0 0
South America [Member]
    
Goodwill [Line Items]    
Gross goodwill, beginning of the period 13.5 15.1
Accumulated impairments, beginning of the period 0 0
Net goodwill balance, beginning of the period 13.5 15.1
Gross goodwill, Fluctuations in foreign currency (1.3) (1.6)
Accumulated impairments, Fluctuations in foreign currency 0 0
Net goodwill balance, Fluctuations in foreign currency (1.3) (1.6)
Gross goodwill, Acquisition 0  
Accumulated impairments, Acquisition 0  
Net goodwill balance, Acquisition 0  
Gross goodwill, ending of the period 12.2 13.5
Accumulated impairments, ending of the period 0 0
Net goodwill balance, ending of the period 12.2 13.5
Commercial Products [Member]
    
Goodwill [Line Items]    
Gross goodwill, beginning of the period 15.9 15.9
Accumulated impairments, beginning of the period 0 0
Net goodwill balance, beginning of the period 15.9 15.9
Gross goodwill, Fluctuations in foreign currency (0.7) 0
Accumulated impairments, Fluctuations in foreign currency 0 0
Net goodwill balance, Fluctuations in foreign currency (0.7) 0
Gross goodwill, Acquisition 0.8  
Accumulated impairments, Acquisition 0  
Net goodwill balance, Acquisition 0.8  
Gross goodwill, ending of the period 16.0 15.9
Accumulated impairments, ending of the period 0 0
Net goodwill balance, ending of the period $ 16.0 $ 15.9