Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Revenue from External Customers by Product Line

Net sales by product line are presented below:

	2015		2014		2013
Carbon	$	4,746.8	$	4,423.3	$	3,643.4
Stainless and electrical	1,733.0		1,836.5		1,705.3
Tubular	201.3		231.4		220.7
Other	11.8		14.5		1.0
Total	$	6,692.9	$	6,505.7	$	5,570.4

Schedule of Percentage of Net Sales by Market

Percentages of our net sales attributable to various markets are presented below:

	2015		2014		2013
Automotive	60	%	53	%	51	%
Infrastructure and Manufacturing	16	%	18	%	20	%
Distributors and Converters	24	%	29	%	29	%