Fair Value Measurements (Schedule Of Face And Fair Value Of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Face Value	$ 2,270.3	$ 2,005.3
Fair Value	2,436.3	2,281.2
Fixed Rate [Member]
Debt Instrument [Line Items]
Face Value	2,220.3	1,955.3
Fair Value	2,386.3	2,231.2
Variable Rate [Member]
Debt Instrument [Line Items]
Face Value	50.0	50.0
Fair Value	$ 50.0	$ 50.0