Derivative Instruments and Hedging Activities (Summary Of Accumulated Other Comprehensive Loss Related To Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Before-Tax Amount
Accumulated derivative net losses as of December 31, 2014		$ (0.2)
Net changes in fair value of derivatives		(4.4)
Net losses reclassified from accumulated other comprehensive loss into income		1.9
Accumulated derivative net losses as of September 30, 2015	$ (2.7)	(2.7)
Income Tax
Accumulated derivative net losses as of December 31, 2014		(0.1)
Net changes in fair value of derivatives		(1.0)
Net losses reclassified from accumulated other comprehensive loss into income		0.2
Accumulated derivative net losses as of September 30, 2015	(0.9)	(0.9)
After-Tax Amount
Accumulated derivative net losses as of December 31, 2014		(0.1)
Net changes in fair value of derivatives		(3.4)
Net losses reclassified from accumulated other comprehensive loss into income		1.7
Accumulated derivative net losses as of September 30, 2015	$ (1.8)	$ (0.1)