Supplemental Disclosures (Tables)

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental Cash Flow Information

($ in millions)

	For the Years Ended December 31,
	2014		2013		2012
Interest paid	$	6.0	$	2.5	$	2.6
Income taxes paid	17.6		69.8		33.7
	At December 31,
	2014		2013		2012
Capital spending in accounts payable and accrued liabilities	2.5		3.6		4.3

Allowance for Doubtful Accounts [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Allowance for Doubtful Accounts

Analysis of Allowances for Doubtful Accounts:

($ in millions)

	For the Years Ended December 31,
	2014			2013			2012
Allowance for doubtful accounts
Beginning balance	$	0.4		$	0.7		$	0.7
Bad debt expense	0.3			—			0.1
Write-offs and discounts	(0.4		)	(0.2		)	(0.1		)
Currency translation	—			(0.1		)	—
Ending balance	$	0.3		$	0.4		$	0.7