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Dividends (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Dividends Paid and Proposed

	2018 cents per share				2017 cents per share				2016 cents per share				2018 $m				2017 $m				2016 $m
Paid during the year:
Final (declared for previous year)			71.0				64.0				57.5				130				127				137
Interim			36.3				33.0				30.0				69				62				56
Special (note 27)			0				202.5				632.9				0				404				1,500

			107.3				299.5				720.4				199				593				1,693

Proposed (not recognised as a liability at 31 December):
Final			78.1				71.0				64.0				141				135				126