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Derivative Financial Instruments - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Oct. 07, 2010
Jun. 02, 2010
Jun. 01, 2010
Dec. 31, 2009
Derivative [Line Items]                
Unamortized Loss on Derivative Instruments     $ 62.6 $ 72.0        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     9.5          
Loss on settlement of derivative instruments 36.7 26.8            
Notional Amount of Interest Rate Cash Flow Hedge Derivatives             150.0  
Notional Amount of Interest Rate Derivatives         140.7     290.7
Debt Instrument, Face Amount         $ 250.0 $ 150.0    
Debt Instrument, Interest Rate, Stated Percentage         4.80% 6.00%    
Debt Instrument, Interest Rate, Effective Percentage         6.26% 7.67%