Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2017

Accounts Receivable

Summary of trade accounts receivable

        The following is a summary of trade accounts receivable at December 31, (in millions):

	2017			2016
Gross accounts receivable	$	324.0		$	251.8
Allowance for doubtful accounts		(4.7	)		(7.9	)
Accounts receivable, net	$	319.3		$	243.9

Summary of activity in the allowance for doubtful accounts

        The following is a summary of the activity in the Company's allowance for doubtful accounts at December 31, (in millions):

	Balance at Beginning of Period		Additions Charged to Expense		Deductions Amounts Written Off			Foreign Currency Impact			Balance at End of Period
2017	$	7.9	$	0.5	$	(4.4	)	$	0.7			4.7
2016		9.1		0.9		(2.0	)		(0.1	)		7.9
2015		10.1		2.1		(2.5	)		(0.6	)		9.1