Operating Leases (Tables)

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Schedule Of Future Commitments Under Non Cancelable Operating Leases

As of December 31, 2014, the company's total future commitments by year under non-cancelable operating leases are as follows:

$ in millions	Total	Buildings	Other
2015	71.6	68.5	3.1
2016	72.2	69.2	3.0
2017	60.5	57.6	2.9
2018	61.6	59.1	2.5
2019	56.2	53.8	2.4
Thereafter	206.2	203.7	2.5
Gross lease commitments	528.3	511.9	16.4
Less: future minimum payments expected to be received under non-cancelable subleases	66.0	66.0	—
Net lease commitments	462.3	445.9	16.4