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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic benefit cost (income)
The components of net periodic benefit cost for the three months ended March 31, 2014 and 2013 were as follows:
 
 
Three months ended
March 31,
 
 
2014
 
2013
 
($ in millions)
Service cost
 
$
0.1

 
$
0.2

Interest cost
 
1.2

 
1.1

Expected return on plan assets
 
(2.1
)
 
(1.8
)
Amortization of unrecognized loss
 
0.1

 
0.2

Net periodic pension income before special termination benefits
 
(0.7
)
 
(0.3
)
Special termination benefits expense(1)
 
0.3

 
0.2

Total net periodic benefit income
 
$
(0.4
)
 
$
(0.1
)
_______________________________________________________________________________
(1)
Special termination benefits represent additional payments made from the Qualified Plan to certain vested participants when their employment was terminated due to a reduction in force.