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Royalties Paid - Summary of Royalties Paid (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Royalty Payment [Abstract] |  |  |  |  |
Amount owing at beginning of the year - continuing operations | $ (19.8) | $ (17.8) |  | $ (19.9) |
Royalties | (62.0) | (78.4) | [1] | (73.9) | [1]
Amount owing at end of the year - continuing operations | 16.3 | 19.8 |  | 17.8 |
Translation | (0.5) | 0.0 |  | 1.0 |
Total royalties paid - continuing operations | $ (66.0) | $ (76.4) | [2] | $ (75.0) | [2]
[1] | As Restated - Refer note 40 for further details.
[2] | The restatement is as a result of the discontinued operations.

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