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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 € in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 EUR (€)
Foreign currency contracts | Net Investment Hedging
Derivative [Line Items]
Derivative, notional amount	$ 361.3		$ 361.3		$ 374.2
Gain (loss) on derivative used in net investment hedge, net of tax	1.9	$ (11.8)	12.8	$ (38.9)
Foreign currency contracts | Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount	109.3		109.3		96.8
Interest rate swap contract | Cash Flow Hedging
Derivative [Line Items]
Derivative, notional amount	361.3		361.3			€ 312.0
Cross currency swap contract | Net Investment Hedging
Derivative [Line Items]
Derivative, notional amount	300.0		300.0		$ 0.0
Gain (loss) on derivative used in net investment hedge, net of tax	$ 0.1	$ 0.0	$ 11.7	$ 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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+ References

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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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