v3.5.0.2

Investments and Related Party Transactions - Schedule of Related Party Balances (Detail) - Chlorovinyls [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Investments [Line Items] |  |  |
Equity method investments | $ 15.8 | $ 11.0 | $ 11.7
Receivables due from affiliates | 4.1 | 5.5 | 5.0
Amounts due to affiliates | 0.2 | 0.4 | 1.9
Equity in earnings from equity method investments | 0.5 | 0.6 | 0.8
Sales [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amounts due to affiliates | $ 17.1 | $ 16.9 | $ 10.8

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