Financial Instruments - Derivatives (Details) € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) t	Jun. 30, 2015 JPY (¥)	Jun. 30, 2015 KRW (₩)	Jun. 30, 2015 CNY (¥)	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 GBP (£)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 JPY (¥)	Dec. 31, 2014 KRW (₩)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 GBP (£)
Commodity contracts | Maturity December 2016
Derivative [Line Items]
Notional amount of copper commodity contracts | t	439.0
Foreign currency | Chinese yuan | Maturity June 2016
Derivative [Line Items]
Notional amount of currency derivatives | €					€ 33.2						€ 0.0
Foreign currency | Chinese yuan | Maturity December 2016
Derivative [Line Items]
Notional amount of currency derivatives	$ 20.0						$ 24.9
Foreign currency | Euro | Maturity December 2015
Derivative [Line Items]
Notional amount of currency derivatives | £						£ 2.9						£ 5.7
Foreign currency | Euro | Maturity February 2016
Derivative [Line Items]
Notional amount of currency derivatives | ¥		¥ 2,582.0						¥ 4,371.8
Foreign currency | Euro | Maturity December 2016
Derivative [Line Items]
Notional amount of currency derivatives	32.1						23.5
Foreign currency | Japanese yen | Maturity December 2015
Derivative [Line Items]
Notional amount of currency derivatives	2.0		₩ 3,290.0	¥ 45.4			3.8		₩ 6,712.5	¥ 88.6
Foreign currency | Korean won | Maturity December 2015
Derivative [Line Items]
Notional amount of currency derivatives	11.4	¥ 440.1			5.1		22.7	¥ 72.0			2.5
Foreign currency | Mexican peso | Maturity December 2015
Derivative [Line Items]
Notional amount of currency derivatives	$ 6.0						$ 22.6
Foreign currency | Swedish krona | Maturity December 2015
Derivative [Line Items]
Notional amount of currency derivatives | €					€ 15.9						€ 31.4