Other Comprehensive Income/(Loss) (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income/(loss) were as follows:

	For the three months ended March 31, 2018
$ in millions	Foreign currency translation		Employee benefit plans		Equity method investments		Available-for-sale investments		Total
Other comprehensive income/(loss) net of tax:
Currency translation differences on investments in foreign subsidiaries	64.6		—		—		—		64.6
Other comprehensive income, net	—		0.4		(2.3	)	0.3		(1.6	)
Other comprehensive income/(loss), net of tax	64.6		0.4		(2.3	)	0.3		63.0
Beginning balance	(290.5	)	(109.7	)	4.3		4.7		(391.2	)
Adjustment for adoption of ASU 2016-01	—		—		—		(3.2	)	(3.2	)
January 1, 2018, as adjusted	(290.5	)	(109.7	)	4.3		1.5		(394.4	)
Other comprehensive income/(loss), net of tax	64.6		0.4		(2.3	)	0.3		63.0
Ending balance	(225.9	)	(109.3	)	2.0		1.8		(331.4	)

	For the three months ended March 31, 2017
$ in millions	Foreign currency translation		Employee benefit plans		Equity method investments	Available-for-sale investments	Total
Other comprehensive income/(loss) net of tax:
Currency translation differences on investments in foreign subsidiaries	62.6		—		—	—	62.6
Other comprehensive income, net	—		0.2		0.3	2.5	3.0
Other comprehensive income/(loss)	62.6		0.2		0.3	2.5	65.6
Beginning balance	(679.9	)	(139.2	)	4.8	5.0	(809.3	)
Other comprehensive income/(loss)	62.6		0.2		0.3	2.5	65.6
Ending balance	(617.3	)	(139.0	)	5.1	7.5	(743.7	)