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Related Party Transactions (Details) - NSP China - Subsidiaries - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Notes receivable, related parties, current | $ 6.0 | $ 6.0 | $ 2.0
Company's Joint Venture Partner |  |  |
Related Party Transaction [Line Items] |  |  |
Notes receivable, related parties, current | 1.5 | 1.5 | $ 0.5
Notes Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | 2.0 | $ 4.0 |
Related party transaction, rate |  | 3.00% |
Notes Receivable | Company's Joint Venture Partner |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, amount | $ 0.5 | $ 1.0 |

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- Details
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