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Assets Classified As Held For Sale (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Non-current Assets Held For Sale And Discontinued Operations [Abstract]      
Assets classified as held for sale $ 27.4 $ 30.1 [1] $ 28.9 [1]
[1] Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)