Employee Benefits (Details 1) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Allocation of Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans, by Segment
Net periodic benefit cost and charges relating to other benefit plans	$ (0.2)	$ 2.5	$ 2.0	$ 7.5
Fabricated Products [Member]
Allocation of Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans, by Segment
Net periodic benefit cost and charges relating to other benefit plans	1.7	1.7	5.7	5.2
All Other [Member]
Allocation of Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans, by Segment
Net periodic benefit cost and charges relating to other benefit plans	$ (1.9)	$ 0.8	$ (3.7)	$ 2.3