Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Changes in Accumulated Other Comprehensive Income, Net of Tax

	Foreign currency translation adjustment	Unrealized holding gain/(loss) on available-for-sale securities	Accumulated other comprehensive income
	$M	$M	$M
As at January 1, 2013	85.1	1.8	86.9
Current period change	(36.1)	(1.7)	(37.8)
As at March 31, 2013	49.0	0.1	49.1