Schedule II - Valuation and Qualifying Accounts (Notes)

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts

Schedule II - Valuation and Qualifying Accounts

($ in millions)	Balance at beginning of period		Charged to costs and expenses			Deductions (1)			Balance at end of period
For the year ended December 31, 2017
Allowances deducted from assets:
Deferred tax asset valuation allowance	$	18.7	$	2.5		$	(0.3	)	$	20.9
Allowance for doubtful accounts	0.4		(0.2		)	0.3			0.5
Total allowances deducted from assets	$	19.1	$	2.3		$	—		$	21.4
For the year ended December 31, 2016
Allowances deducted from assets:
Deferred tax asset valuation allowance	$	20.1	$	(1.3	)	$	(0.1	)	$	18.7
Allowance for doubtful accounts	0.6		—			(0.2		)	0.4
Total allowances deducted from assets	$	20.7	$	(1.3	)	$	(0.3	)	$	19.1
For the year ended December 31, 2015
Allowances deducted from assets:
Deferred tax asset valuation allowance	$	22.1	$	(0.3	)	$	(1.7	)	$	20.1
Allowance for doubtful accounts	0.9		0.1			(0.4		)	0.6
Total allowances deducted from assets	$	23.0	$	(0.2	)	$	(2.1	)	$	20.7

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(1) Includes accounts receivable written off, the write-off or write-down of valuation allowances, and translation adjustments.