Goodwill and Intangible Assets, Amortization Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Expected amortization of intangible assets for the remainder of 2012 and the next four years
2012	$ 0.5		$ 0.5
2013	1.7		1.7
2014	1.6		1.6
2015	1.6		1.6
2016	1.6		1.6
Thereafter	28.9		28.9
Total	35.9		35.9		37.2
Amortization expense related to definite-lived intangible assets recorded in Fabricated products Segment	$ 0.4	$ 0.5	$ 1.3	$ 1.6