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Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | $ 1,542.0 | $ 1,533.5 |
Additions | 113.2 | 78.6 |
Disposals | (57.4) | (68.0) |
Exchange differences | (3.7) | (2.1) |
Cost, Ending balance | 1,646.3 | 1,542.0 | $ 1,533.5
Other | (6.1) |  |
Adjustment | 58.3 |  |
Accumulated depreciation, Beginning balance | (675.0) | (653.4) |
Charge for the year | (80.3) | (76.3) | (70.2)
Disposals | 42.4 | 51.6 |
Exchange differences | 2.3 | 3.1 |
Accumulated depreciation, Ending balance | (767.3) | (675.0) | (653.4)
Other | 1.6 |  |
Adjustment | (58.3) |  |
Net book amount | 879.0 | 867.0 |
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 70.1 | 70.2 |
Additions | 1.3 |  |
Exchange differences | (0.4) | (0.1) |
Cost, Ending balance | 69.5 | 70.1 | 70.2
Transfers | 1.9 |  |
Adjustment | (3.4) |  |
Net book amount | 69.5 | 70.1 |
Buildings [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 266.0 | 239.8 |
Additions | 2.3 | 27.0 |
Disposals | (1.4) | (0.7) |
Exchange differences | (0.8) | (0.1) |
Cost, Ending balance | 344.5 | 266.0 | 239.8
Transfers | 23.1 |  |
Other | (12.5) |  |
Adjustment | 67.8 |  |
Accumulated depreciation, Beginning balance | (98.2) | (88.2) |
Charge for the year | (10.2) | (10.7) |
Disposals | 1.3 | 0.5 |
Exchange differences | 0.3 | 0.2 |
Accumulated depreciation, Ending balance | (128.0) | (98.2) | (88.2)
Other | 1.6 |  |
Adjustment | (22.8) |  |
Net book amount | 216.5 | 167.8 |
Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 1,062.4 | 974.6 |
Additions | 27.8 | 155.5 |
Disposals | (55.5) | (65.8) |
Exchange differences | (2.4) | (1.9) |
Cost, Ending balance | 1,175.7 | 1,062.4 | 974.6
Transfers | 112.3 |  |
Adjustment | 31.1 |  |
Accumulated depreciation, Beginning balance | (576.8) | (565.2) |
Charge for the year | (70.1) | (65.6) |
Disposals | 41.1 | 51.1 |
Exchange differences | 2.0 | 2.9 |
Accumulated depreciation, Ending balance | (639.3) | (576.8) | (565.2)
Adjustment | (35.5) |  |
Net book amount | 536.4 | 485.6 |
Construction in Progress [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cost, Beginning balance | 143.5 | 248.9 |
Additions | 81.8 | (103.9) |
Disposals | (0.5) | (1.5) |
Exchange differences | (0.1) |  |
Cost, Ending balance | 56.6 | 143.5 | $ 248.9
Transfers | (137.3) |  |
Other | 6.4 |  |
Adjustment | (37.2) |  |
Net book amount | $ 56.6 | $ 143.5 |

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