Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Property, Plant and Equipment (Details)

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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Property, plant and equipment      
Cost $ 1,251.9 $ 1,228.9 $ 1,168.9
Accumulated depreciation (586.4) (521.2) (458.3)
Property, Plant and Equipment, Net, Total 665.5 707.7 710.6
Changes in net book value:      
Capital expenditure 35.8 50.3  
Retirements and sales (0.3) (0.7)  
Depreciation (65.2) (62.9)  
Impairment charge (14.3)    
Foreign currency translation adjustments 1.8 10.4  
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total (42.2) (2.9)  
Land [Member]
      
Property, plant and equipment      
Cost 18.3 18.3 18.1
Accumulated depreciation         
Property, Plant and Equipment, Net, Total 18.3 18.3 18.1
Changes in net book value:      
Capital expenditure    0.2  
Retirements and sales        
Depreciation        
Impairment charge       
Foreign currency translation adjustments        
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total    0.2  
Buildings [Member]
      
Property, plant and equipment      
Cost 209.6 209.6 205.2
Accumulated depreciation (75.3) (66.5) (57.0)
Property, Plant and Equipment, Net, Total 134.3 143.1 148.2
Changes in net book value:      
Capital expenditure   4.4  
Retirements and sales        
Depreciation (8.8) (9.5)  
Impairment charge       
Foreign currency translation adjustments        
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total (8.8) (5.1)  
Machinery and Equipment [Member]
      
Property, plant and equipment      
Cost 982.3 966.5 897.9
Accumulated depreciation (511.1) (454.7) (401.3)
Property, Plant and Equipment, Net, Total 471.2 511.8 496.6
Changes in net book value:      
Capital expenditure 28.6 58.9  
Retirements and sales (0.3) (0.7)  
Depreciation (56.4) (53.4)  
Impairment charge (14.3)    
Foreign currency translation adjustments 1.8 10.4  
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total (40.6) 15.2  
Construction in Progress [Member]
      
Property, plant and equipment      
Cost 41.7 34.5 47.7
Accumulated depreciation         
Property, Plant and Equipment, Net, Total 41.7 34.5 47.7
Changes in net book value:      
Capital expenditure 7.2 (13.2)  
Retirements and sales        
Depreciation        
Impairment charge       
Foreign currency translation adjustments        
Property, Plant and Equipment, Gross, Period Increase (Decrease), Total $ 7.2 $ (13.2)