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Correction of Methodology - Summary of Cumulative Impact of the Correction of the Amortisation Methodology (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Beginning balance | [1] | $ 3,173.3 | $ 2,756.3 |  | $ 3,655.7 |
Profit or loss |  | (7.7) | 169.1 | [1] | (247.8) | [1]
Translation |  | 279.9 | 129.7 | [1] | (635.9) | [1]
Ending balance |  | 3,403.0 | 3,173.3 | [1] | 2,756.3 | [1]
Balance at beginning of the year |  | 409.9 | 428.1 | [1] |  |
Translation |  | 0.1 | (3.6) | [1] |  |
Deferred tax liability asset ending balance |  |  | 409.9 |  | 428.1 | [1]
Property plant and equipment beginning balance | [1] | 4,524.6 | 4,295.6 |  |  |
Carrying value at end of the year |  | 4,892.9 | 4,524.6 | [1] | 4,295.6 | [1]
Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Beginning balance |  | (16.3) | (11.7) |  | (7.6) |
Profit or loss |  |  | (4.7) |  | (5.2) |
Translation |  |  | 0.1 |  | 1.1 |
Ending balance |  |  | (16.3) |  | (11.7) |
Balance at beginning of the year |  | 6.9 | 5.1 |  | 3.3 |
Profit or loss |  |  | 2.0 |  | 2.2 |
Translation |  |  | (0.2) |  | (0.4) |
Deferred tax liability asset ending balance |  |  | 6.9 |  | 5.1 |
Property plant and equipment beginning balance |  | (23.2) | (16.8) |  | (10.9) |
Profit or loss |  |  | (6.6) |  | (7.4) |
Translation |  |  | 0.2 |  | 1.5 |
Carrying value at end of the year |  |  | (23.2) |  | (16.8) |
Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member] | St Ives [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Beginning balance |  | (26.3) | (20.1) |  | (13.7) |
Profit or loss |  |  | (6.5) |  | (8.2) |
Translation |  |  | 0.3 |  | 1.8 |
Ending balance |  |  | (26.3) |  | (20.1) |
Balance at beginning of the year |  | 11.3 | 8.6 |  | 5.9 |
Profit or loss |  |  | 2.8 |  | 3.5 |
Translation |  |  | (0.1) |  | (0.8) |
Deferred tax liability asset ending balance |  |  | 11.3 |  | 8.6 |
Property plant and equipment beginning balance |  | (37.6) | (28.7) |  | (19.6) |
Profit or loss |  |  | (9.2) |  | (11.7) |
Translation |  |  | 0.3 |  | 2.6 |
Carrying value at end of the year |  |  | (37.6) |  | (28.7) |
Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member] | Agnew Lawlers [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Beginning balance |  | 9.2 | 7.6 |  | 5.5 |
Profit or loss |  |  | 1.7 |  | 2.8 |
Translation |  |  | (0.1) |  | (0.7) |
Ending balance |  |  | 9.2 |  | 7.6 |
Balance at beginning of the year |  | (4.0) | (3.2) |  | (2.3) |
Profit or loss |  |  | (0.8) |  | (1.2) |
Translation |  |  | 0.0 |  | 0.3 |
Deferred tax liability asset ending balance |  |  | (4.0) |  | (3.2) |
Property plant and equipment beginning balance |  | 13.2 | 10.8 |  | 7.8 |
Profit or loss |  |  | 2.5 |  | 4.0 |
Translation |  |  | (0.1) |  | (1.0) |
Carrying value at end of the year |  |  | 13.2 |  | 10.8 |
Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member] | Granny Smith [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Beginning balance |  | 0.8 | 0.8 |  | 0.6 |
Profit or loss |  |  | 0.1 |  | 0.2 |
Translation |  |  | (0.1) |  | 0.0 |
Ending balance |  |  | 0.8 |  | 0.8 |
Balance at beginning of the year |  | (0.4) | (0.3) |  | (0.3) |
Profit or loss |  |  | 0.0 |  | (0.1) |
Translation |  |  | (0.1) |  | 0.1 |
Deferred tax liability asset ending balance |  |  | (0.4) |  | (0.3) |
Property plant and equipment beginning balance |  | $ 1.2 | 1.1 |  | 0.9 |
Profit or loss |  |  | 0.1 |  | 0.3 |
Translation |  |  | 0.0 |  | (0.1) |
Carrying value at end of the year |  |  | $ 1.2 |  | $ 1.1 |
[1] | As Restated - Refer note 40 for further details.

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