Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2016

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

Changes in Accumulated Other Comprehensive Income, Net of Tax

	Foreign currency translation adjustment	Unrealized holding loss on available-for-sale securities	Accumulated other comprehensive loss
	$M	$M	$M
As of January 1, 2016	(182.1)	(1.7)	(183.8)
Current period change:
Net current period other comprehensive income/(loss)	24.7	(0.3)	24.4
As of March 31, 2016	(157.4)	(2.0)	(159.4)
	Foreign currency translation adjustment	Unrealized holding (loss)/gain on available-for-sale securities	Accumulated other comprehensive loss
	$M	$M	$M
As of January 1, 2015	(25.7)	(5.8)	(31.5)
Current period change:
Net current period other comprehensive (loss)/income	(129.5)	0.7	(128.8)
As of March 31, 2015	(155.2)	(5.1)	(160.3)