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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Net assets associated with foreign currency derivatives	$ (4.3)		$ (4.3)		$ (19.7)
Maturity period of derivatives (in months)			18 months
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months			$ (2.4)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments		$ (4.2)
Designated as Hedging Instrument [Member] | Foreign Exchange [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate cash flow hedges outstanding	204.0		204.0
Cash flow hedges outstanding for British pounds	95.9		95.9
Cash flow hedges outstanding for euros	30.3		30.3
Cash flow hedges outstanding for Australian dollars	40.5		40.5
Cash flow hedges outstanding for Brazilian reals	23.4		23.4
Cash flow hedges outstanding for other currencies	13.9		13.9
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	(0.4)		0.5	$ (13.2)
Not Designated as Hedging Instrument [Member] | Foreign Exchange [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate cash flow hedges outstanding	144.1		144.1
Cash flow hedges outstanding for British pounds	13.1		13.1
Cash flow hedges outstanding for euros	81.3		81.3
Cash flow hedges outstanding for Brazilian reals	10.7		10.7
Cash flow hedges outstanding for Indonesian rupiah	11.4		11.4
Cash flow hedges outstanding for Swiss francs	18.2		18.2
Cash flow hedges outstanding for other currencies	$ 9.4		$ 9.4

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