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Investments in Affiliates and Other Related Party Transactions - Summarized Balance Sheet Data for Affiliates Accounted for under Equity Method (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Balance sheet data: |  |
Current assets | $ 856.3 | $ 753.8
Non-current assets | 173.9 | 180.8
Current liabilities | 739.5 | 679.3
Non-current liabilities | $ 6.6 | $ 6.3

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