Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Other Current Liabilities [Abstract]

Other current liabilities

($ in millions)	2017		2016
Deferred income	$	18.4	$	13.2
Other accrued expenses	27.7		20.3
Dividends payable	10.4		9.5
Restructuring obligations	2.1		5.9
Other	18.4		9.4
Total other current liabilities	$	77.0	$	58.3