Other Comprehensive Income/(Loss) (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Accumulated Other Comprehensive Income

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

	For the three months ended September 30, 2019
$ 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	(133.4	)	—		—	—	(133.4	)
Other comprehensive income, net	—		0.5		—	—	0.5
Other comprehensive income/(loss), net of tax	(133.4	)	0.5		—	—	(132.9	)
Beginning balance	(555.2	)	(116.9	)	0.1	0.6	(671.4	)
Other comprehensive income/(loss), net of tax	(133.4	)	0.5		—	—	(132.9	)
Ending balance	(688.6	)	(116.4	)	0.1	0.6	(804.3	)

	For the nine months ended September 30, 2019
$ 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	(71.0	)	—		—	—	(71.0	)
Other comprehensive income, net	—		1.3		0.1	0.3	1.7
Other comprehensive income/(loss), net of tax	(71.0	)	1.3		0.1	0.3	(69.3	)
Beginning balance	(617.6	)	(117.7	)	—	0.3	(735.0	)
Other comprehensive income/(loss), net of tax	(71.0	)	1.3		0.1	0.3	(69.3	)
Ending balance	(688.6	)	(116.4	)	0.1	0.6	(804.3	)

	For the three months ended September 30, 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	(23.6	)	—		—	—		(23.6	)
Other comprehensive income, net	—		1.4		0.9	(0.8	)	1.5
Other comprehensive income/(loss), net of tax	(23.6	)	1.4		0.9	(0.8	)	(22.1	)
Beginning balance	(459.5	)	(107.4	)	2.0	1.2		(563.7	)
Other comprehensive income/(loss), net of tax	(23.6	)	1.4		0.9	(0.8	)	(22.1	)
Ending balance	(483.1	)	(106.0	)	2.9	0.4		(585.8	)

	For the nine months ended September 30, 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	(192.6	)	—		—		—		(192.6	)
Other comprehensive income, net	—		3.7		(1.4	)	(1.1	)	1.2
Other comprehensive income/(loss), net of tax	(192.6	)	3.7		(1.4	)	(1.1	)	(191.4	)
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	(192.6	)	3.7		(1.4	)	(1.1	)	(191.4	)
Ending balance	(483.1	)	(106.0	)	2.9		0.4		(585.8	)