v2.4.0.6
Fair Value (Details) (Fair Value, Recurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Financial instruments measured at fair value, on a recurring basis  
Trading securities $ 11.4
Interest rate swaps (5.8)
Total financial instruments at fair value 5.6
Level 1 [Member]
 
Financial instruments measured at fair value, on a recurring basis  
Trading securities 11.4
Total financial instruments at fair value 11.4
Level 2 [Member]
 
Financial instruments measured at fair value, on a recurring basis  
Interest rate swaps (5.8)
Total financial instruments at fair value (5.8)
Level 3 [Member]
 
Financial instruments measured at fair value, on a recurring basis  
Trading securities   
Interest rate swaps   
Total financial instruments at fair value