Financial Instruments - Derivatives (Details) € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, PLN in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2017 PLN t	Dec. 31, 2016 PLN t	Mar. 31, 2017 USD ($)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 KRW (₩)	Mar. 31, 2017 CNY (¥)	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 GBP (£)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 JPY (¥)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 GBP (£)	Jul. 20, 2016 USD ($)
Foreign currency | US dollar | Maturity June 2017
Derivative [Line Items]
Notional amount of currency derivatives | ₩					₩ 25,269.3						₩ 0.0
Foreign currency | Korean won | Maturity December 2017
Derivative [Line Items]
Notional amount of currency derivatives			$ 17.9	¥ 649.6			€ 9.8		$ 14.2	¥ 539.9			€ 0.0
Foreign currency | Japanese yen | Maturity December 2017
Derivative [Line Items]
Notional amount of currency derivatives			1.5		₩ 4,317.1	¥ 52.1			2.0		₩ 5,689.2	¥ 68.7
Foreign currency | Euro | Maturity December 2017
Derivative [Line Items]
Notional amount of currency derivatives	PLN 100.6	PLN 18.8	30.5	¥ 1,711.2		¥ 93.8		£ 3.1	35.3	¥ 1,004.8		¥ 0.0		£ 4.2
Foreign currency | Chinese renminbi | Maturity December 2017
Derivative [Line Items]
Notional amount of currency derivatives			22.6						33.5
Foreign currency | Swedish krona | Maturity December 2017
Derivative [Line Items]
Notional amount of currency derivatives | €							37.6						48.2
Foreign currency | Brazil, Brazil Real | Maturity January 2018
Derivative [Line Items]
Notional amount of currency derivatives | €							€ 2.8						€ 0.0
Foreign currency | Mexico, Pesos | Maturity December 2017
Derivative [Line Items]
Notional amount of currency derivatives			$ 9.6						$ 10.5
Commodity contracts | Maturity December 2017
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | t	156.4	213.8
Interest rate swaps
Derivative [Line Items]
Notional amount of currency derivatives															$ 384.0