Dividends (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Dividends Paid And Proposed

	2017 cents per share		2016 cents per share		2015 cents per share		2017 $m		2016 $m		2015 $m
Paid during the year:
Final (declared for previous year)		64.0		57.5		52.0		127		137		125
Interim		33.0		30.0		27.5		62		56		63
Special (note 27)		202.5		632.9		—		404		1,500		—
		299.5		720.4		79.5		593		1,693		188
Proposed (not recognised as a liability at 31 December):
Final		71.0		64.0		57.5		135		126		135