Acquisitions (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 14, 2011 Singer Steel Company [Member]	Dec. 09, 2011 Turret Steel [Member]
Summary of estimated fair values of the assets acquired and liabilities
Cash	$ 0.3	$ 1.8
Restricted cash	6.5
Accounts receivable	7.3	12.0
Inventory	16.3	26.7
Property, plant, and equipment	8.2	2.9
Intangible assets	4.3	45.1
Goodwill		25.1
Other assets	0.2	1.2
Total identifiable assets acquired	43.1	114.8
Current liabilities	11.4	17.5
Deferred tax liabilities	2.3	18.5
Total liabilities assumed	13.7	36.0
Net identifiable assets acquired	29.4
Bargain purchase	(5.8)
Net assets acquired	$ 23.6	$ 78.8