Other Post-Retirement Employee Benefit Plans (Effect Of One-Percentage-Point Change In Assumed Health Care Cost Trend Rates) (Details) (Other Post-Retirement Benefits, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Effect on the total of service and interest cost components, 1% increase	$ 0.6
Effect on the total of service and interest cost components, 1% decrease	(0.4)
Effect on post-retirement medical benefit obligation, 1% increase	8.1
Effect on post-retirement medical benefit obligation, 1% decrease	$ (7.2)