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Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components Of Net Periodic Benefit Cost
The components of net periodic benefit cost in respect of these defined benefit plans are as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
Retirement Plans
 
Medical Plan
 
Retirement Plans
 
Medical Plan
$ in millions
2012
 
2011
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
(1.1
)
 
(1.1
)
 
(0.1
)
 
(0.1
)
 
(2.2
)
 
(2.1
)
 
(0.2
)
 
(0.3
)
Interest cost
(4.8
)
 
(4.5
)
 
(0.6
)
 
(0.6
)
 
(9.6
)
 
(9.1
)
 
(1.2
)
 
(1.3
)
Expected return on plan assets
4.4

 
3.8

 
0.1

 
0.1

 
8.8

 
7.5

 
0.2

 
0.2

Amortization of prior service cost
—

 
(0.7
)
 
0.5

 
0.5

 
—

 
(1.5
)
 
1.0

 
1.0

Amortization of net actuarial (loss)/gain
(0.3
)
 
0.2

 
(0.1
)
 
(0.7
)
 
(0.6
)
 
0.3

 
(0.2
)
 
(1.4
)
Net periodic benefit cost
(1.8
)
 
(2.3
)
 
(0.2
)
 
(0.8
)
 
(3.6
)
 
(4.9
)
 
(0.4
)
 
(1.8
)