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 ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Movement in Property, Plant and Equipment [Roll Forward]      
Cost, Beginning balance $ 1,646,300,000 $ 1,542,000,000  
Additions 217,800,000 113,200,000  
Transfers   0  
Disposals (34,900,000) (57,400,000)  
Other   (6,100,000)  
Exchange differences 800,000 (3,700,000)  
Adjustment   58,300,000  
Cost, Ending balance 1,830,000,000 1,646,300,000 $ 1,542,000,000
Movement in Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment [Roll Forward]      
Accumulated depreciation, Beginning balance (767,300,000) (675,000,000)  
Charge for the year (88,900,000) (80,300,000) (76,300,000)
Disposals 18,500,000 42,400,000  
Other   1,600,000  
Exchange differences (200,000) 2,300,000  
Adjustment   (58,300,000)  
Accumulated depreciation, Ending balance (837,900,000) (767,300,000) (675,000,000)
Net book amount 992,100,000 879,000,000  
Land [Member]      
Movement in Property, Plant and Equipment [Roll Forward]      
Cost, Beginning balance 69,500,000 70,100,000  
Additions 0 1,300,000  
Transfers   1,900,000  
Disposals (1,400,000) 0  
Other   0  
Exchange differences 100,000 (400,000)  
Adjustment   (3,400,000)  
Cost, Ending balance 68,200,000 69,500,000 70,100,000
Movement in Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment [Roll Forward]      
Accumulated depreciation, Beginning balance 0 0  
Charge for the year 0 0  
Disposals 0 0  
Other   0  
Exchange differences 0 0  
Adjustment   0  
Accumulated depreciation, Ending balance 0 0 0
Net book amount 68,200,000 69,500,000  
Buildings [Member]      
Movement in Property, Plant and Equipment [Roll Forward]      
Cost, Beginning balance 344,500,000 266,000,000  
Additions 7,900,000 2,300,000  
Transfers   23,100,000  
Disposals (5,600,000) (1,400,000)  
Other   (12,500,000)  
Exchange differences 0 (800,000)  
Adjustment   67,800,000  
Cost, Ending balance 346,800,000 344,500,000 266,000,000
Movement in Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment [Roll Forward]      
Accumulated depreciation, Beginning balance (128,000,000) (98,200,000)  
Charge for the year (11,300,000) (10,200,000)  
Disposals 1,900,000 1,300,000  
Other   1,600,000  
Exchange differences 0 300,000  
Adjustment   (22,800,000)  
Accumulated depreciation, Ending balance (137,400,000) (128,000,000) (98,200,000)
Net book amount 209,400,000 216,500,000  
Machinery and Equipment [Member]      
Movement in Property, Plant and Equipment [Roll Forward]      
Cost, Beginning balance 1,175,700,000 1,062,400,000  
Additions 83,800,000 27,800,000  
Transfers   112,300,000  
Disposals (24,300,000) (55,500,000)  
Other   0  
Exchange differences 900,000 (2,400,000)  
Adjustment   31,100,000  
Cost, Ending balance 1,236,100,000 1,175,700,000 1,062,400,000
Movement in Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment [Roll Forward]      
Accumulated depreciation, Beginning balance (639,300,000) (576,800,000)  
Charge for the year (77,600,000) (70,100,000)  
Disposals 16,600,000 41,100,000  
Other   0  
Exchange differences (200,000) 2,000,000  
Adjustment   (35,500,000)  
Accumulated depreciation, Ending balance (700,500,000) (639,300,000) (576,800,000)
Net book amount 535,600,000 536,400,000  
Construction in Progress [Member]      
Movement in Property, Plant and Equipment [Roll Forward]      
Cost, Beginning balance 56,600,000 143,500,000  
Additions 126,100,000 81,800,000  
Transfers   (137,300,000)  
Disposals (3,600,000) (500,000)  
Other   6,400,000  
Exchange differences (200,000) (100,000)  
Adjustment   (37,200,000)  
Cost, Ending balance 178,900,000 56,600,000 143,500,000
Movement in Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment [Roll Forward]      
Accumulated depreciation, Beginning balance 0 0  
Charge for the year 0 0  
Disposals 0 0  
Other   0  
Exchange differences 0 0  
Adjustment   0  
Accumulated depreciation, Ending balance 0 0 $ 0
Net book amount $ 178,900,000 $ 56,600,000