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Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of defined benefit plans
The components of net periodic benefit cost in respect of these defined benefit plans are as follows:
 
Retirement Plans
 
Medical Plan
 
For the three months ended June 30,
 
For the six months ended June 30,
 
For the three months ended June 30,
 
For the six months ended June 30,
$ in millions
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
1.4

 
1.3

 
2.8

 
2.5

 
—

 
—

 
—

 
—

Interest cost
4.4

 
5.2

 
8.8

 
10.5

 
—

 
—

 
—

 
—

Expected return on plan assets
(5.7
)
 
(6.1
)
 
(11.4
)
 
(12.3
)
 
—

 
(0.1
)
 
—

 
(0.2
)
Amortization of prior service cost/(credit)
—

 
0.1

 
—

 
0.1

 
(2.9
)
 
(2.5
)
 
(4.9
)
 
(4.7
)
Amortization of net actuarial (gain)/loss
0.5

 
0.7

 
1.0

 
1.3

 
—

 
—

 
—

 
—

Net periodic benefit cost/(benefit)
0.6

 
1.2

 
1.2

 
2.1

 
(2.9
)
 
(2.6
)
 
(4.9
)
 
(4.9
)