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Reserves - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reserves within equity [line items]      
Gains (losses) on cash flow hedges, net of tax   $ 1.1 $ (5.4)
Deferred income taxes on items taken to other comprehensive income $ (5.8) $ 4.3 (0.4)
Number of shares purchased 0 (634,185)  
Hedging reserve      
Disclosure of reserves within equity [line items]      
Increase (decrease) in equity $ 3.1 $ 0.2  
Gains (losses) on cash flow hedges, net of tax 3.1 (1.1) (5.4)
Transfer (gains) losses to consolidated income statement on cash flow hedges (0.6) $ 0.9 0.1
Deferred income taxes on items taken to other comprehensive income $ (0.6)   $ 1.1
Share based compensation reserve      
Disclosure of reserves within equity [line items]      
Number of shares purchased 0 0