Financial Instruments and Risk Management (Effect Of Derivative Instruments on the Condensed Consolidated Statements of Operations Derivatives in Fair Value Hedging Relationships) (Details) - Fair Value Hedging Relationships - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Earnings on Derivatives	$ 29.6	$ 20.5
Amount of Loss Recognized in Earnings on Hedged Items	(29.6)	(15.9)
Interest expense | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Earnings on Derivatives	29.6	20.5
Interest expense | 2023 Senior Notes (3.125% coupon)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Earnings on Hedged Items	$ (29.6)	$ (15.9)