Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2019

Related Party Transactions [Abstract]

Schedule of related party transactions

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

	Three months ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Net sales to Glencore	$	305.0	$	282.7	$	616.4	$	579.0
Purchases from Glencore	115.6		100.0		206.3		148.5
Purchases from BHH	8.5		8.1		14.6		15.5