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Retirement Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2011
General Discussion of Pension and Other Postretirement Benefits [Abstract] 
Components Of Net Periodic Benefit Cost
 
Three months ended September 30,
 
Nine months ended September 30,
 
Retirement Plans
 
Medical Plan
 
Retirement Plans
 
Medical Plan
$ in millions
2011
 
2010
 
2011
 
2010
 
2011
 
2010
 
2011
 
2010
Service cost
1.0

 
0.9

 
0.2

 
0.1

 
3.1

 
2.9

 
0.5

 
0.2

Interest cost
4.6

 
3.9

 
0.7

 
0.7

 
13.7

 
11.7

 
2.0

 
2.0

Expected return on plan assets
(3.7
)
 
(3.4
)
 
(0.1
)
 
(0.1
)
 
(11.2
)
 
(10.3
)
 
(0.3
)
 
(0.3
)
Amortization of prior service cost
0.8

 
—

 
(0.5
)
 
(0.5
)
 
2.3

 
—

 
(1.5
)
 
(1.5
)
Amortization of net actuarial (loss)/gain
(0.1
)
 
0.7

 
0.6

 
0.9

 
(0.4
)
 
2.0

 
2.0

 
2.7

Net periodic benefit cost
2.6

 
2.1

 
0.9

 
1.1

 
7.5

 
6.3

 
2.7

 
3.1