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Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | $ (811.7) |  |
Payment received in accordance with AFFA | 62.8 |  |
AICF operating costs paid - non claims-handling | (1.7) | $ (2.5) | $ (2.1)
Change in actuarial estimate | 2.4 | (129.0) | (340.3)
Change in claims handling cost estimate | 1.2 | 1.1 | $ 0.9
Movement in Income Tax Payable | (19.5) |  |
Other movements | (2.1) |  |
Effect of foreign exchange | (2.6) |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | (766.7) | (811.7) |
Asbestos Liability [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | (1,421.6) |  |
Asbestos claims paid | 113.9 |  |
AICF claims-handling costs incurred (paid) | 1.2 |  |
Change in actuarial estimate | 2.4 |  |
Change in claims handling cost estimate | 1.2 |  |
Effect of foreign exchange | 0.7 |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | (1,302.2) | (1,421.6) |
Insurance Receivables [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | 178.6 |  |
Change in actuarial estimate | 4.5 |  |
Insurance recoveries | (17.2) |  |
Effect of foreign exchange | (0.2) |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | 165.7 | 178.6 |
Deferred Tax Assets [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | 405.2 |  |
Movement in Income Tax Payable | (18.9) |  |
Other movements | (1.7) |  |
Effect of foreign exchange | 0.3 |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | 384.9 | 405.2 |
Other Loan Facilities [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | (13.6) |  |
Funds received from NSW under loan agreement | (60.5) |  |
Funds repaid to NSW under loan agreement | 27.3 |  |
Effect of foreign exchange | (3.9) |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | (50.7) | (13.6) |
Restricted Cash and Investments [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | 22.0 |  |
Asbestos claims paid | (113.9) |  |
Payment received in accordance with AFFA | 62.8 |  |
AICF claims-handling costs incurred (paid) | (1.2) |  |
AICF operating costs paid - non claims-handling | (1.7) |  |
Insurance recoveries | 17.2 |  |
Funds received from NSW under loan agreement | 60.5 |  |
Funds repaid to NSW under loan agreement | (27.3) |  |
Other movements | (0.7) |  |
Effect of foreign exchange | (0.7) |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | 17.0 | 22.0 |
Other Assets and Liabilities [Member] |  |  |
Asbestos Claims [Line Items] |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | 17.7 |  |
Movement in Income Tax Payable | (0.6) |  |
Other movements | 0.3 |  |
Effect of foreign exchange | 1.2 |  |
Net Unfunded AFFA liability, net of tax, Ending Balance | $ 18.6 | $ 17.7 |

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- Definition Portion of deferred income tax asset that becomes available to the Company as an Australian tax deduction resulting from the Company's previous contributions to AICF. + References No definition available. + Details
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