Debt Instrument, Purchase Price of Repurchased Debt

No definition available.

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Balance Type:	debit
Period Type:	instant

- Definition

Debt Repurchase, Convertible, Conversion Ratio

+ References

No definition available.

+ Details

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- Definition

Debt instrument, Repurchase Amount, Principal Amount

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Deferred Gain On Hedge Termination

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Number Of Loan Agreements Entered

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Unamortized Deferred Gain On Hedge Termination

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Balance Type:	credit
Period Type:	instant

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-Section S99
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+ Details

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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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Indebtedness (Narrative) (Details)			3 Months Ended	12 Months Ended
Indebtedness (Narrative) (Details)	May 09, 2018 USD ($)	Apr. 30, 2016 EUR (€) loan_agreement	Mar. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Oct. 31, 2016 EUR (€) loan_agreement	Dec. 31, 2014 EUR (€)
Debt Instrument [Line Items]
Debt instrument, unused borrowing capacity \| €									€ 200,000,000.0
Remaining borrowing capacity on line of credit facility			$ 360,700,000
Outstanding letters of credit			$ 14,100,000			$ 15,200,000
Line of Credit [Member] \| Interest Accrual, Option Two [Member]
Debt Instrument [Line Items]
Margin on variable rate			0.50%
Line of Credit [Member] \| Interest Accrual, Option Three [Member]
Debt Instrument [Line Items]
Margin on variable rate			1.00%
Line of Credit [Member] \| Minimum [Member] \| Interest Accrual, Option One [Member]
Debt Instrument [Line Items]
Margin on variable rate			1.00%
Line of Credit [Member] \| Minimum [Member] \| Interest Accrual, Option Three [Member] \| Variable Basis, Additional Margin [Member]
Debt Instrument [Line Items]
Margin on variable rate			0.00%
Line of Credit [Member] \| Maximum [Member] \| Interest Accrual, Option One [Member]
Debt Instrument [Line Items]
Margin on variable rate			1.75%
Line of Credit [Member] \| Maximum [Member] \| Interest Accrual, Option Three [Member] \| Variable Basis, Additional Margin [Member]
Debt Instrument [Line Items]
Margin on variable rate			0.25%
Term Loan Facility [Member]
Debt Instrument [Line Items]
Amount outstanding			$ 384,500,000		€ 312,000,000	374,200,000	€ 312,000,000
Credit facility			823,800,000			471,200,000
Number of loan agreements entered \| loan_agreement								7
Debt instrument, face amount			462,100,000.0					€ 375,000,000
Senior Unsecured Term Loan Due January 15, 2020, 1.056% [Member]
Debt Instrument [Line Items]
Senior notes			$ 246,500,000		€ 200,000,000.0	$ 239,800,000
Debt instrument, interest rate, percent			1.056%		1.056%	1.056%	1.056%
5 7/8% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Senior notes			$ 305,000,000			$ 305,300,000
Debt instrument, interest rate, percent			5.875%		5.875%	5.875%	5.875%
Debt instrument, face amount			$ 305,000,000			$ 305,300,000
Debt instrument, redemption price, percentage			100.00%
5 7/8% Senior Notes due 2021 [Member] \| Interest Accrual, Option Two [Member]
Debt Instrument [Line Items]
Margin on variable rate			0.50%
Senior Unsecured Term Loan Due April 26, 2021, Total [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Margin on variable rate		1.00%
Senior Unsecured Term Loan Due April 26, 2021, Total [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Margin on variable rate		1.75%
Senior Unsecured Term Loan Due April 26, 2021, First Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		€ 100,000,000	$ 123,200,000
Senior Unsecured Term Loan Due April 26, 2021, Second Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		€ 200,000,000.0	239,800,000
Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity on line of credit facility			800,000,000
Credit facility			$ 439,300,000			97,000,000
Remaining borrowing capacity on line of credit facility						703,000,000
Rabobank [Member] \| Senior Unsecured Term Loan Due April 26, 2021, Total [Member]
Debt Instrument [Line Items]
Number of loan agreements entered \| loan_agreement		2
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, percent			0.33%		0.33%
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Deferred gain on hedge termination				$ 7,300,000
Unamortized Deferred Gain On Hedge Termination			$ 5,000,000			$ 5,300,000
Amortization of deferred hedge gains			$ 300,000
Subsequent Event [Member]
Debt Instrument [Line Items]
Amortization of deferred hedge gains	$ 3,000,000
Repurchase amount, principal	$ 185,900,000
Conversion ratio	1.0775
Purchase price of repurchased debt	$ 200,300,000
Loss on Extinguishment of Debt	$ 15,700,000