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Joint Ventures (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) joint_venture | Dec. 31, 2018 USD ($) joint_venture | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity investment in joint ventures | $ 51.9 | $ 51.9 | $ 68.5 |
Impairment charge | 15.0 |  |  |
Current assets | 116.7 | 116.7 | 111.5 |
Noncurrent assets | 183.6 | 183.6 | 206.2 |
Current liabilities | 65.3 | 65.3 | 64.8 |
Long-term liabilities | 100.9 | 100.9 | 114.7 |
Stockholder's equity | $ 134.1 | 134.1 | 138.2 |
Net sales |  | 109.7 | 105.0 | $ 107.5
Gross profit |  | 33.4 | 29.1 | 36.5
Net income |  | $ 7.4 | 4.9 | 9.5
China |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of joint ventures | joint_venture | 2 | 2 |  |
Ownership of joint ventures (as a percent) | 50.00% | 50.00% |  |
Other income, net |  | $ 2.2 | $ 2.1 | $ 2.0

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