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Correction of Methodology - Summary of Consolidated Statement of Financial Position (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |  |  |  |  |
Property, plant and equipment |  | $ 4,892.9 | $ 4,524.6 | [1] | $ 4,295.6 | [1] |  |
Others | [1] |  | 1,786.9 |  | 1,565.3 |  |  |
Total assets |  | 6,620.1 | 6,311.5 | [1] | 5,860.9 | [1] |  |
LIABILITIES |  |  |  |  |  |  |  |
Deferred taxation |  | 453.9 | 458.6 | [1] | 482.2 | [1] |  |
Others | [1] |  | 2,679.6 |  | 2,622.4 |  |  |
Total liabilities | [1] |  | 3,138.2 |  | 3,104.6 |  |  |
Retained earnings |  | 1,471.1 | 1,552.6 | [1] | 1,433.6 | [1] |  |
Other reserves |  | (1,817.8) | (2,124.4) | [1] | (2,260.2) | [1] |  |
Others | [1] |  | 3,745.1 |  | 3,582.9 |  |  |
Total equity |  | 3,403.0 | 3,173.3 | [1] | 2,756.3 | [1] | $ 3,655.7 | [1]
Total equity and liabilities |  | $ 6,620.1 | 6,311.5 | [1] | 5,860.9 | [1] |  |
Previously Stated [member] |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 4,547.8 |  | 4,312.4 |  |  |
Others |  |  | 1,786.9 |  | 1,565.3 |  |  |
Total assets |  |  | 6,334.7 |  | 5,877.7 |  |  |
LIABILITIES |  |  |  |  |  |  |  |
Deferred taxation |  |  | 465.5 |  | 487.3 |  |  |
Others |  |  | 2,679.6 |  | 2,622.4 |  |  |
Total liabilities |  |  | 3,145.1 |  | 3,109.7 |  |  |
Retained earnings |  |  | 1,570.9 |  | 1,447.3 |  |  |
Other reserves |  |  | (2,126.4) |  | (2,262.2) |  |  |
Others |  |  | 3,745.1 |  | 3,582.9 |  |  |
Total equity |  |  | 3,189.6 |  | 2,768.0 |  | $ 3,663.3 |
Total equity and liabilities |  |  | 6,334.7 |  | 5,877.7 |  |  |
Adjustments [Member] |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | (23.2) |  | (16.8) |  |  |
Others |  |  | 0.0 |  |  |  |  |
Total assets |  |  | (23.2) |  | (16.8) |  |  |
LIABILITIES |  |  |  |  |  |  |  |
Deferred taxation |  |  | (6.9) |  | (5.1) |  |  |
Others |  |  | 0.0 |  |  |  |  |
Total liabilities |  |  | (6.9) |  | (5.1) |  |  |
Retained earnings |  |  | (18.3) |  | (13.7) |  |  |
Other reserves |  |  | 2.0 |  | 2.0 |  |  |
Others |  |  | 0.0 |  |  |  |  |
Total equity |  |  | (16.3) |  | (11.7) |  |  |
Total equity and liabilities |  |  | (23.2) |  | (16.8) |  |  |
As Restated Before Reclassification of Discontinued Operation [member] |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 4,524.6 |  | 4,295.6 |  |  |
Others |  |  | 1,786.9 |  | 1,565.3 |  |  |
Total assets |  |  | 6,311.5 |  | 5,860.9 |  |  |
LIABILITIES |  |  |  |  |  |  |  |
Deferred taxation |  |  | 458.6 |  | 482.2 |  |  |
Others |  |  | 2,679.6 |  | 2,622.4 |  |  |
Total liabilities |  |  | 3,138.2 |  | 3,104.6 |  |  |
Retained earnings |  |  | 1,552.6 |  | 1,433.6 |  |  |
Other reserves |  |  | (2,124.4) |  | (2,260.2) |  |  |
Others |  |  | 3,745.1 |  | 3,582.9 |  |  |
Total equity |  |  | 3,173.3 |  | 2,756.3 |  |  |
Total equity and liabilities |  |  | 6,311.5 |  | 5,860.9 |  |  |
Discontinued operation reclassification [member] |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 0.0 |  | 0.0 |  |  |
Others |  |  | 0.0 |  | 0.0 |  |  |
Total assets |  |  | 0.0 |  | 0.0 |  |  |
LIABILITIES |  |  |  |  |  |  |  |
Deferred taxation |  |  | 0.0 |  | 0.0 |  |  |
Others |  |  | 0.0 |  | 0.0 |  |  |
Total liabilities |  |  | 0.0 |  | 0.0 |  |  |
Retained earnings |  |  | 0.0 |  | 0.0 |  |  |
Other reserves |  |  | 0.0 |  | 0.0 |  |  |
Others |  |  | 0.0 |  | 0.0 |  |  |
Total equity |  |  | 0.0 |  | 0.0 |  |  |
Total equity and liabilities |  |  | $ 0.0 |  | $ 0.0 |  |  |
[1] | As Restated - Refer note 40 for further details.

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