Share-Based Compensation (Schedule Of Compensation Cost And Related Income Tax Benefit Under Employee Stock Purchase Plan) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 8.1	$ 8.3	$ 6.7
Related income tax benefit	2.8	2.9	2.3
Employee Stock Purchase 1999 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value per share for the Company's ESPP offerings	$ 6.52	$ 4.16	$ 9.02
Compensation cost	0.3	0.3	1.4
Related income tax benefit	$ 0.1	$ 0.1	$ 0.5