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Derivatives And Fair Value Measurements (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Gains and losses from the effective portion of derivative assets and liabilities held in AOCI expected to be reclassified into earnings $ 22.7  
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net 1.5 11.5
Reduction Of Interest Expense Over Life Of Debt Instruments, next 12 months $ 2.2  
Fair Value Inputs, Level 3 [Member]
   
Natural gas hedges original tenure 10 years  
Fair Value Inputs, Level 3 [Member] | Maximum [Member]
   
Unobservable inputs included within the fair value calculation 4.90  
Fair Value Inputs, Level 3 [Member] | Minimum [Member]
   
Unobservable inputs included within the fair value calculation 3.85