Financial Instruments (Summary of Derivative Instruments) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Interest Rate Swap
Derivative [Line Items]
Terminated amount	$ 569.0
Undesignated derivative instruments \| Foreign exchange contracts
Derivative [Line Items]
Notional amount	$ 2,192.4	$ 1,672.3
Maximum duration	11 months	3 months
Fair value - net asset/(liability)	$ (1.3)	$ 11.4
Designated derivative Instruments \| Interest Rate Swap \| Fair Value Hedging
Derivative [Line Items]
Notional amount	431.0	1,000.0
Fair value - net asset/(liability)	(15.6)	$ (7.7)
Other Expense \| Interest Rate Swap
Derivative [Line Items]
Loss on extinguishment	$ 9.3

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

Derivative, Terminated Amount

+ References

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ 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=109250915&loc=d3e13433-108611

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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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.

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- Definition

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

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