Taxation (Tables)

9 Months Ended

Sep. 30, 2019

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, 2018	20.0
Additions for tax positions related to the current year	1.0
Additions for tax positions related to prior years	0.2
Additions for tax positions related to acquisitions	54.1
Other reductions for tax positions related to prior years	(5.3	)
Balance at September 30, 2019	70.0