Derivatives (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011 LBS	Dec. 31, 2010 LBS
Copper [Member]
Outstanding commodity futures contracts designated as cash flow hedges
Notional amounts	18,600,000	18,500,000
Outstanding commodity futures contracts not designated as cash flow hedges
Notional amounts	2,800,000	1,400,000
Aluminum [Member]
Outstanding commodity futures contracts not designated as cash flow hedges
Notional amounts	3,000,000	1,400,000
Brazilian Real [Member]
Outstanding foreign currency forward contracts not designated as cash flow hedges
Notional amounts	3.6	5.6
Mexican Peso [Member]
Outstanding foreign currency forward contracts not designated as cash flow hedges
Notional amounts	160.0	138.0
Euros [Member]
Outstanding foreign currency forward contracts not designated as cash flow hedges
Notional amounts	7.8	15.6
British Pounds [Member]
Outstanding foreign currency forward contracts not designated as cash flow hedges
Notional amounts	5.0	2.0