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Accounting Policies - Revenue Recognition and Accounts Receivable (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) customer	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances and doubtful accounts | $	$ (1.9)	$ (1.5)
Provision for Doubtful Accounts | $	$ 0.0	$ 0.0	$ 0.0
Net sales | Customer concentration risk | Largest customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | customer	1
Percentage of total net sales	10.00%	9.00%	9.00%
Accounts receivable | Customer concentration risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | customer	1

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- Definition

Allowance for Doubtful Accounts Receivable and Sales Discounts, Current

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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