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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Net assets associated with foreign currency derivatives	$ (8.5)		$ (8.5)		$ (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			$ (4.6)
Not Designated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	(3.5)	$ 4.5	0.9	$ (9.0)
Foreign Exchange [Member] | Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate cash flow hedges outstanding	230.3		230.3
Cash flow hedges outstanding for British pounds	107.6		107.6
Cash flow hedges outstanding for Brazilian reals	28.3		28.3
Cash flow hedges outstanding for euros	33.8		33.8
Cash flow hedges outstanding for Australian dollars	43.6		43.6
Cash flow hedges outstanding for other currencies	17.0		17.0
Foreign Exchange [Member] | Not Designated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Aggregate cash flow hedges outstanding	145.2		145.2
Cash flow hedges outstanding for British pounds	16.9		16.9
Cash flow hedges outstanding for Brazilian reals	9.9		9.9
Cash flow hedges outstanding for euros	78.2		78.2
Cash flow hedges outstanding for Indonesian rupiah	12.5		12.5
Cash flow hedges outstanding for Swiss francs	16.0		16.0
Cash flow hedges outstanding for other currencies	$ 11.7		$ 11.7

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Australian dollars hedges outstanding

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Other currencies hedges outstanding

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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