Derivative Financial Instruments (Notional Value Of Outstanding Cash Flow Hedge Contracts By Year Of Maturity And Net Unrealized (Loss) Gain Included In Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Net unrealized gains (losses) included in accumulated other comprehensive income (loss), net of taxes	$ 8.0	$ (11.7)	$ (44.5)	$ (86.7)
Foreign Exchange Forward [Member]
Derivative [Line Items]
Net unrealized gains (losses) included in accumulated other comprehensive income (loss), net of taxes	8.0	(11.7)
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	2,280.0	2,445.0
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2016 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	915.0	1,215.0
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2017 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	1,005.0	900.0
Designated as Hedging Instrument [Member] | Foreign Exchange Forward, Maturity 2018 [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Notional value of contracts outstanding	$ 360.0	$ 330.0