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

Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail)

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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Property, Plant and Equipment [Line Items]    
Cost, Beginning balance $ 1,284.5 $ 1,264.6
Additions 125.2 61.1
Disposals (2.2) (7.3)
Impairment   (37.1)
Exchange differences (28.5) 3.2
Cost, Ending balance 1,379.0 1,284.5
Accumulated depreciation, Beginning balance (625.6) (589.9)
Charge for the year (61.3) (60.0)
Disposals 1.5 6.5
Impairment   20.2
Exchange differences 18.1 (1.8)
Other (0.5) (0.6)
Accumulated depreciation, Ending balance (667.8) (625.6)
Net book amount 711.2 658.9
Land [Member]
    
Property, Plant and Equipment [Line Items]    
Cost, Beginning balance 18.5 18.3
Additions 11.7 0.2
Disposals      
Impairment     
Exchange differences      
Cost, Ending balance 30.2 18.5
Accumulated depreciation, Beginning balance      
Charge for the year      
Disposals      
Impairment     
Exchange differences      
Other      
Accumulated depreciation, Ending balance      
Net book amount 30.2 18.5
Buildings [Member]
    
Property, Plant and Equipment [Line Items]    
Cost, Beginning balance 210.2 210.5
Additions 18.9 3.0
Disposals      
Impairment   (3.5)
Exchange differences (1.0) 0.2
Cost, Ending balance 228.1 210.2
Accumulated depreciation, Beginning balance (85.2) (76.2)
Charge for the year (9.1) (8.8)
Disposals      
Impairment     
Exchange differences 1.0 (0.2)
Other      
Accumulated depreciation, Ending balance (93.3) (85.2)
Net book amount 134.8 125.0
Machinery and Equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Cost, Beginning balance 994.7 984.9
Additions 39.8 47.7
Disposals (2.2) (7.3)
Impairment   (33.6)
Exchange differences (27.5) 3.0
Cost, Ending balance 1,004.8 994.7
Accumulated depreciation, Beginning balance (540.4) (513.7)
Charge for the year (52.2) (51.2)
Disposals 1.5 6.5
Impairment   20.2
Exchange differences 17.1 (1.6)
Other (0.5) (0.6)
Accumulated depreciation, Ending balance (574.5) (540.4)
Net book amount 430.3 454.3
Construction in Progress [Member]
    
Property, Plant and Equipment [Line Items]    
Cost, Beginning balance 61.1 50.9
Additions 54.8 10.2
Disposals      
Impairment     
Exchange differences      
Cost, Ending balance 115.9 61.1
Accumulated depreciation, Beginning balance      
Charge for the year      
Disposals      
Impairment     
Exchange differences      
Other      
Accumulated depreciation, Ending balance      
Net book amount $ 115.9 $ 61.1