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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, 2018	Dec. 31, 2017
Balance sheet data:
Current assets	$ 753.8	$ 961.4
Non-current assets	180.8	203.0
Current liabilities	679.3	813.0
Non-current liabilities	$ 6.3	$ 26.1

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