Financial Instruments - Derivatives (Details) € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, PLN in Millions, MXN in Millions, HUF in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016 PLN t	Dec. 31, 2015 PLN t	Mar. 31, 2016 USD ($)	Mar. 31, 2016 HUF	Mar. 31, 2016 JPY (¥)	Mar. 31, 2016 KRW (₩)	Mar. 31, 2016 CNY (¥)	Mar. 31, 2016 EUR (€)	Mar. 31, 2016 MXN	Mar. 31, 2016 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 HUF	Dec. 31, 2015 JPY (¥)	Dec. 31, 2015 KRW (₩)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 MXN	Dec. 31, 2015 GBP (£)
Foreign currency | Chinese yuan | Maturity December 2016
Derivative [Line Items]
Notional amount of currency derivatives | €								€ 21.7								€ 30.5
Foreign currency | Chinese yuan | Maturity July 2017
Derivative [Line Items]
Notional amount of currency derivatives			$ 15.1								$ 13.8
Foreign currency | Euro | Maturity December 2016
Derivative [Line Items]
Notional amount of currency derivatives	PLN 64.8	PLN 0.0	39.8	HUF 2,560.8	¥ 2,735.4					£ 3.8	30.1	HUF 3,434.5	¥ 487.1					£ 0.0
Foreign currency | Japanese yen | Maturity December 2016
Derivative [Line Items]
Notional amount of currency derivatives			2.0			₩ 4,308.6	¥ 70.0				3.0			₩ 5,998.9	¥ 92.6
Foreign currency | Korean won | Maturity December 2016
Derivative [Line Items]
Notional amount of currency derivatives			62.5		¥ 483.2			€ 1.9			$ 77.9		¥ 0.0			€ 2.5
Foreign currency | US dollar | Maturity September 2016
Derivative [Line Items]
Notional amount of currency derivatives | MXN									MXN 314.8								MXN 469.0
Commodity contracts | Maturity December 2016
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | t	4,525.6	6,273.2
Interest rate swap
Derivative [Line Items]
Notional amount of currency derivatives			384.0
Interest rate swap | Maturity September 2020
Derivative [Line Items]
Notional amount of currency derivatives			250.0
Interest rate swap | Maturity October 2019
Derivative [Line Items]
Notional amount of currency derivatives			$ 134.0