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Royalties Paid - Summary of Royalties Paid (Detail) - USD ($)
$ in Millions
 12 Months Ended
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.