Derivatives (Outstanding Commodity Futures Contracts) (Details) - lb lb in Millions	Dec. 31, 2016	Dec. 31, 2015
Copper [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amounts	2.4	3.3
Copper [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional Amounts	30.4	34.7
Aluminum [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amounts	2.6	3.2