Guarantees (Tables)

3 Months Ended

Mar. 31, 2018

Guarantees [Abstract]

Summary of Warranty Activity

Below is a table summarizing the warranty activity for the three months ended March 31, 2018 and the year ended December 31, 2017:

($ in millions)	Three Months Ended March 31, 2018			Year Ended December 31, 2017
Balance at beginning of period	$	35.2		$	28.6
Accruals for warranties issued during the period		5.4			34.6
Settlements made (in cash or in kind) during the    period		(5.8	)		(29.9	)
Currency translation		0.4			1.9
Balance at end of period	$	35.2		$	35.2