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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2014
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
2014
 
2013
 
2014
 
2013
Service cost
(1.1
)
 
(1.1
)
 
(0.1
)
 
(0.1
)
Interest cost
(4.8
)
 
(4.9
)
 
(0.5
)
 
(0.5
)
Expected return on plan assets
4.6

 
4.4

 
0.2

 
0.1

Amortization of prior service cost/(credit)
—

 
—

 
0.5

 
0.5

Amortization of net actuarial gain/(loss)
(0.5
)
 
(0.6
)
 
(0.1
)
 
(0.1
)
Net periodic benefit cost
(1.8
)
 
(2.2
)
 
—

 
(0.1
)