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=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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

Changes in Operations Australia (Details)	12 Months Ended
Changes in Operations Australia (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Arrium Limited [Member] USD ($) carload	Dec. 31, 2014 Arrium Limited [Member] AUD	Dec. 31, 2013 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] USD ($)	Dec. 31, 2013 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] AUD	Dec. 31, 2012 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] USD ($)	Dec. 31, 2012 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] AUD
Business Acquisition [Line Items]
GWA Investment in narrow gauge locomotives, railcars and maintenance facility						$ 19,900,000	22,300,000	$ 54,100,000	52,100,000
Annual carloads transported				26,000	26,000
Operating revenues	$ 1,639,012,000us-gaap_SalesRevenueNet	$ 1,568,643,000us-gaap_SalesRevenueNet	$ 874,916,000us-gaap_SalesRevenueNet	$ 52,000,000	65,000,000