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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 |  |  |
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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

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- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
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