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Investments in Affiliates and Other Related Party Transactions - Summarized Group Financial Information for Affiliates Accounted for under Equity Method (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance sheet data: |  |  |
Current assets | $ 961.4 | $ 1,011.0 |
Non-current assets | 203.0 | 197.3 |
Current liabilities | 813.0 | 850.5 |
Non-current liabilities | 26.1 | 26.6 |
Income statement data: |  |  |
Net sales | 2,000.4 | 2,186.4 | $ 2,087.8
Gross profit | 172.8 | 200.6 | 155.5
Income before provision for income taxes | 169.6 | 195.3 | 127.4
Net income attributable to affiliates | $ 117.8 | $ 155.4 | $ 96.0

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