v2.4.0.8
Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (62.3)   $ (65.5)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1.0)   0.3  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.3   3.2  
Other Comprehensive Income (Loss), Net of Tax 0.3 1.9 3.5 0.7
Ending Balance (62.0)   (62.0)  
Accumulated Net Unrealized Investment Gain (Loss) [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2.2   2.6  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (2.8)   (2.9)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (0.1)   (0.4)  
Other Comprehensive Income (Loss), Net of Tax (2.9)   (3.3)  
Ending Balance (0.7)   (0.7)  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (27.7)   (28.6)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (0.1)   0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.6   1.4  
Other Comprehensive Income (Loss), Net of Tax 0.5   1.4  
Ending Balance (27.2)   (27.2)  
Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (36.8)   (39.5)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1.9   3.2  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.8   2.2  
Other Comprehensive Income (Loss), Net of Tax 2.7   5.4  
Ending Balance $ (34.1)   $ (34.1)