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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	$ (9.7)	$ 29.5	$ 30.2	$ 34.1
Amount of Gain (Loss) Recognized in Earnings on Hedged Items	9.7	(25.0)	(30.2)	(20.4)
Interest expense | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Earnings on Derivatives	(9.7)	29.5	30.2	34.1
Interest expense | 2023 Senior Notes (3.125% coupon)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Earnings on Hedged Items	$ 9.7	$ (25.0)	$ (30.2)	$ (20.4)