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Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable [Line Items]
Less allowance for doubtful accounts and sales discounts	$ (1.7)	$ (1.0)
Total accounts receivable, net	154.6	149.4
Trade receivables
Accounts Receivable [Line Items]
Accounts receivable, gross	130.9	120.2
Business tax credits, including VAT
Accounts Receivable [Line Items]
Accounts receivable, gross	4.0	4.3
Hedge contracts receivable
Accounts Receivable [Line Items]
Accounts receivable, gross	2.1	4.8
Other receivables
Accounts Receivable [Line Items]
Accounts receivable, gross	$ 19.3	$ 21.1

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