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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