Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities (Details)

v2.4.0.6
Derivative Instruments and Hedging Activities (Details) (Interest Rate Swap [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Interest Rate Swap [Member]
     
Aggregate Interest Rate Swaps and Fair Value of Liabilities Outstanding [Abstract]      
Aggregate Notional Amounts $ 140.0 $ 140.0  
Average Swap Rate 2.78% 2.78% 2.78%
Aggregate Fair Value $ (5.1) $ (6.6)  
Maturity dates Jun. 01, 2013 Jun. 01, 2013 Jul. 01, 2013