XML 31 R21.htm IDEA: XBRL DOCUMENT v3.8.0.1

Related party transactions (Tables)

3 Months Ended

Mar. 31, 2018

Related Party Transactions [Abstract]

Schedule of related party transactions

A summary of the aforementioned significant related party transactions is as follows: 

	Three months ended March 31,
	2018				2017
Net sales to Glencore	$	296.2			$	280.6
Purchases from Glencore	48.4				71.6
Purchases from BHH	7.4				2.8

X

- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration