Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingent Liabilities [Abstract]

Future minimum rental payments under non-cancelable operating leases

At December 31, 2011, future minimum rental payments under non-cancelable operating leases were:

Year	($ in millions)
2012	$	12.2
2013		6.3
2014		5.6
2015		4.1
2016		3.5
Thereafter		17.6
Total		49.3
Less sublease income		0.4
	$	48.9