Employee Benefits, Net Periodic Benefit Costs Segment Allocation (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Allocation of Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans, by Segment | ||||
| Defined benefit plan net periodic benefit (income ) cost and (benefits) charges relating to other benefit plans | $ (0.4) | $ 2.4 | $ 1.6 | $ 10.0 |
Fabricated Products [Member] | ||||
| Allocation of Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans, by Segment | ||||
| Defined benefit plan net periodic benefit (income ) cost and (benefits) charges relating to other benefit plans | 1.7 | 1.8 | 7.4 | 7.0 |
All Other [Member] | ||||
| Allocation of Defined Benefit Plan Net Periodic Benefit Cost And Charges Relating To Other Benefit Plans, by Segment | ||||
| Defined benefit plan net periodic benefit (income ) cost and (benefits) charges relating to other benefit plans | $ (2.1) | $ 0.6 | $ (5.8) | $ 3.0 |