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Derivative Instruments and Hedging Activities (Notional Values and After-Tax Impact of Changes in Fair Value) (Details) - Designated as Hedging Instrument [Member] - Net Investment Hedging [Member] € in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 EUR (€)
Derivative [Line Items]
Gain (loss) on derivative used in net investment hedge, net of tax			$ 10.9	$ (27.1)
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, notional amount	$ 363.3		363.3		$ 374.2	€ 312.0
Gain (loss) on derivative used in net investment hedge, net of tax	21.2	$ (22.9)
Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, notional amount	300.0		300.0		$ 0.0
Gain (loss) on derivative used in net investment hedge, net of tax	$ 16.2	$ 0.0	$ 11.6	$ 0.0

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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

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+ References

No definition available.

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- Definition

Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998896-113959

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

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