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

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

Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- 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.

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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Financial Instruments - Derivatives and Hedging (Details) € in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 30.5	$ 30.5		$ 31.8
Derivative remaining maturity		1 year
Interest rate swaps \| Notes Payable to Banks \| USD Notes
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 1,130.0	$ 1,130.0
Interest rate swap rate (as a percent)	1.96%	1.96%	1.96%
Interest rate swaps \| Notes Payable to Banks \| Euro Notes
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount \| €			€ 277
Interest rate swap rate (as a percent)	1.20%	1.20%	1.20%
Not Designated as Hedging Instrument \| Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount	$ 125.0	$ 125.0		$ 201.0
Derivative remaining maturity		1 year
Designated as Hedging Instrument \| Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of ineffectiveness on net investment hedges	0.2	$ 0.8
Gain (loss) to be reclassified during next 12 months	$ 6.7	$ 6.7