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Principles Of Consolidation (Fair Value Measurement) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current $ 20.0 $ 59.7
Restricted amounts held in escrow-long term 102.5 96.3
Total assets at fair value 122.5 156.0
Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current 0 0
Restricted amounts held in escrow-long term 0 0
Total assets at fair value 0 0
Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current 0 0
Restricted amounts held in escrow-long term 0 0
Total assets at fair value 0 0
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted amounts held in escrow-current 20.0 59.7
Restricted amounts held in escrow-long term 102.5 96.3
Total assets at fair value $ 122.5 $ 156.0