Segment Reporting - Segment Reporting Information by Operating Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Segment Reporting Information [Line Items]
Revenue, net	$ 580.9	$ 476.7	$ 1,698.4	$ 1,102.0
Operating Segments [Member] \| All Other [Member]
Segment Reporting Information [Line Items]
Revenue, net	40.2	40.2	123.3	132.4
Operating Segments [Member] \| Discontinued Operations, Disposed of by Sale [Member] \| Concentrate [Member] \| All Other [Member]
Segment Reporting Information [Line Items]
Revenue, net	$ 9.5	$ 9.0	$ 31.4	$ 29.7

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration