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Financial Instruments, Risk Management and Fair Value Measurements Financial Instrument, Risk Management and Fair Value Measurement, Narrative (Details)	Dec. 31, 2018 USD ($) MMBTU	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Estimated fair value of debt	$ 2,715,200,000	$ 3,250,600,000
Carrying amount of debt	2,692,700,000	3,185,600,000
Foreign currency contracts | Designated as Cash Flow Hedges
Segment Reporting Information [Line Items]
Derivative, notional amount	1,331,600,000
Foreign currency contracts | Not Designated as Hedging Instruments
Segment Reporting Information [Line Items]
Derivative, notional amount	$ 1,075,200,000
Energy contracts | Designated as Cash Flow Hedges
Segment Reporting Information [Line Items]
Aggregate notional volume of outstanding natrual gas (mmBTU) | MMBTU	0
Foreign currency and energy contracts | Designated as Cash Flow Hedges
Segment Reporting Information [Line Items]
Gain on derivative contracts	$ 10,200,000
Cash Flow Hedging
Segment Reporting Information [Line Items]
Foreign currency forward contracts in AOCI	(11,200,000)	(5,200,000)	$ (7,100,000)	$ 6,200,000
Cash Flow Hedging | Designated as Cash Flow Hedges
Segment Reporting Information [Line Items]
Foreign currency forward contracts in AOCI	(200,000)
Cash Flow Hedging | Foreign currency contracts
Segment Reporting Information [Line Items]
Foreign currency forward contracts in AOCI	(10,400,000)	(4,400,000)	(4,600,000)	6,100,000
Cash Flow Hedging | Interest rate contracts | Designated as Cash Flow Hedges
Segment Reporting Information [Line Items]
Derivative, notional amount	200,000,000.0
Cash Flow Hedging | Energy contracts
Segment Reporting Information [Line Items]
Foreign currency forward contracts in AOCI	$ 0	$ 0	$ (1,400,000)	$ 1,300,000

X

- Definition

Aggregate amount of price risk derivatives designated as a cash flow hedge with notional amounts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase.

+ References

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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-Topic 220
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-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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