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Other Post-Retirement Employee Benefit Plans (Effect Of One-Percentage-Point Change In Assumed Health Care Cost Trend Rates) (Details) - Other Post-Retirement Benefits
$ in Millions
12 Months Ended
Dec. 31, 2014
USD ($)
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)