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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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