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, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance sheet data:
Current assets	$ 1,011.0	$ 977.7
Non-current assets	197.3	211.5
Current liabilities	850.5	823.2
Non-current liabilities	26.6	34.2
Income statement data:
Net sales	2,186.4	2,087.8	$ 2,074.4
Gross profit	200.6	155.5	123.4
Income before provision for income taxes	195.3	127.4	112.3
Net income attributable to affiliates	$ 155.4	$ 96.0	$ 85.6