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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
For the three months ended March 31,
$ in millions
2016
 
2015
 
2016
 
2015
Service cost
1.4

 
1.2

 
—

 
—

Interest cost
4.4

 
5.3

 
—

 
—

Expected return on plan assets
(5.7
)
 
(6.2
)
 
—

 
(0.1
)
Amortization of prior service cost/(credit)
—

 
—

 
(2.0
)
 
(2.2
)
Amortization of net actuarial (gain)/loss
0.5

 
0.6

 
(0.1
)
 
—

Net periodic benefit cost/(benefit)
0.6

 
0.9

 
(2.1
)
 
(2.3
)