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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of changes in equity [abstract]      
Hedging reserve $ 0.2 $ 3.3 $ 3.5
Translation reserve 46.3 57.9 44.8
Merger reserve 333.8 333.8 333.8
Share based compensation reserve $ 5.4 $ 3.8 $ 4.1