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Royalties Paid - Summary of Royalties Paid (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Royalty Payment [abstract] |  |  |
Amount owing at beginning of the year - continuing operations | $ (16.3) | $ (19.8) | $ (17.8)
Royalties | (62.5) | (62.0) | (78.4)
Amount owing at end of the year - continuing operations | 12.5 | 16.3 | 19.8
Translation | 0.8 | (0.5) | 0.0
Total royalties paid - continuing operations | $ (65.5) | $ (66.0) | $ (76.4)

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