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Other Comprehensive Income/(Loss) (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Accumulated Other Comprehensive Income
The components of accumulated other comprehensive income/(loss) were as follows:
 
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
)

 
For the three months ended September 30, 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
142.4

 
—

 
—

 
—

 
142.4

Other comprehensive income, net
—

 
5.3

 
(0.1
)
 
(1.9
)
 
3.3

Other comprehensive income/(loss), net of tax
142.4

 
5.3

 
(0.1
)
 
(1.9
)
 
145.7

 
 
 
 
 
 
 
 
 
 
Beginning balance
(469.9
)
 
(138.5
)
 
6.0

 
8.2

 
(594.2
)
Other comprehensive income/(loss), net of tax
142.4

 
5.3

 
(0.1
)
 
(1.9
)
 
145.7

Ending balance
(327.5
)
 
(133.2
)
 
5.9

 
6.3

 
(448.5
)