Derivatives (Details 1) - lb lb in Millions	Jun. 30, 2015	Dec. 31, 2014
Designated as Hedging Instrument [Member] | Copper [Member]
Derivative [Line Items]
Derivative, nonmonetary notional amount	20.2	29.4
Not Designated as Hedging Instrument [Member] | Copper [Member]
Derivative [Line Items]
Derivative, nonmonetary notional amount	2.2	2.9
Not Designated as Hedging Instrument [Member] | Aluminum [Member]
Derivative [Line Items]
Derivative, nonmonetary notional amount	2.2	2.2