Schedule II - Valuation and Qualifying Accounts (Notes)

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, 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, 2019
Allowances deducted from assets:
Deferred tax asset valuation allowance	$	16.0	$	—	$	(0.1)	$	15.9
Allowance for doubtful accounts	2.0		0.1		(1.6)		0.5
Total allowances deducted from assets	$	18.0	$	0.1	$	(1.7)	$	16.4
For the year ended December 31, 2018
Allowances deducted from assets:
Deferred tax asset valuation allowance	$	20.9	$	(3.0)	$	(1.9)	$	16.0
Allowance for doubtful accounts	0.5		0.7		0.8		2.0
Total allowances deducted from assets	$	21.4	$	(2.3)	$	(1.1)	$	18.0
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

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