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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | $ 1,533.5 | $ 1,317.7 |
Additions | 78.6 | 277.9 |
Disposals | (68.0) | (8.3) |
Exchange differences | (2.1) | (53.8) |
Cost, Ending balance | 1,542.0 | 1,533.5 | $ 1,317.7
Accumulated depreciation, Beginning balance | (653.4) | (614.9) |
Charge for the year | (76.3) | (70.2) | (61.3)
Disposals | 51.6 | 7.1 |
Exchange differences | 3.1 | 24.6 |
Accumulated depreciation, Ending balance | (675.0) | (653.4) | (614.9)
Net book amount | 867.0 | 880.1 |
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 70.2 | 28.7 |
Additions |  | 41.5 |
Exchange differences | (0.1) |  |
Cost, Ending balance | 70.1 | 70.2 | 28.7
Net book amount | 70.1 | 70.2 |
Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 239.8 | 212.5 |
Additions | 27.0 | 30.2 |
Disposals | (0.7) | (1.7) |
Exchange differences | (0.1) | (1.2) |
Cost, Ending balance | 266.0 | 239.8 | 212.5
Accumulated depreciation, Beginning balance | (88.2) | (80.9) |
Charge for the year | (10.7) | (9.3) |
Disposals | 0.5 | 0.8 |
Exchange differences | 0.2 | 1.2 |
Accumulated depreciation, Ending balance | (98.2) | (88.2) | (80.9)
Net book amount | 167.8 | 151.6 |
Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 974.6 | 961.1 |
Additions | 155.5 | 72.7 |
Disposals | (65.8) | (6.6) |
Exchange differences | (1.9) | (52.6) |
Cost, Ending balance | 1,062.4 | 974.6 | 961.1
Accumulated depreciation, Beginning balance | (565.2) | (534.0) |
Charge for the year | (65.6) | (60.9) |
Disposals | 51.1 | 6.3 |
Exchange differences | 2.9 | 23.4 |
Accumulated depreciation, Ending balance | (576.8) | (565.2) | (534.0)
Net book amount | 485.6 | 409.4 |
Construction in Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 248.9 | 115.4 |
Additions | (103.9) | 133.5 |
Disposals | (1.5) |  |
Cost, Ending balance | 143.5 | 248.9 | $ 115.4
Net book amount | $ 143.5 | $ 248.9 |

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