Taxation (Tables)

3 Months Ended

Mar. 31, 2020

Income Tax Disclosure [Abstract]

Reconciliation of Beginning and Ending Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

$ in millions	Gross Unrecognized Income Tax Benefits
Balance at December 31, 2019	69.9
Additions for tax positions related to the current year	0.7
Additions for tax positions related to prior years	1.0
Other reductions for tax positions related to prior years	(0.8	)
Reductions for statute closings	(9.3	)
Balance at March 31, 2020	61.5