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Investments in Affiliates and Other Related Party Transactions - Summarized Income Statement Data for Affiliates Accounted for under Equity Method (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income statement data: |  |  |
Net sales | $ 1,520.2 | $ 2,000.4 | $ 2,186.4
Gross profit | 75.9 | 172.8 | 200.6
Income before provision for income taxes | 60.0 | 169.6 | 195.3
Net income attributable to affiliates | $ 42.2 | $ 117.8 | $ 155.4

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