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Fair Value Measurements (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended
May 16, 2012
Senior Redeemable Preferred Stock [Member]
Apr. 08, 2011
Senior Redeemable Preferred Stock [Member]
Jun. 30, 2012
Senior Redeemable Preferred Stock [Member]
Dec. 31, 2011
Senior Redeemable Preferred Stock [Member]
Jun. 30, 2012
Public Preferred Stock [Member]
Jul. 01, 2011
Public Preferred Stock [Member]
Nov. 01, 2012
IT Logistics, Inc [Member]
Subordinated Promissory Note [Member]
Jun. 30, 2012
IT Logistics, Inc [Member]
Subordinated Promissory Note [Member]
Dec. 31, 2011
IT Logistics, Inc [Member]
Subordinated Promissory Note [Member]
Jul. 01, 2011
IT Logistics, Inc [Member]
Subordinated Promissory Note [Member]
Jun. 30, 2012
IT Logistics, Inc [Member]
Senior Redeemable Preferred Stock [Member]
Jun. 30, 2012
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Public Preferred Stock [Member]
Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Public Preferred Stock [Member]
Jun. 30, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Public Preferred Stock [Member]
Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure [Member]
Public Preferred Stock [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]                              
Face value of debt instrument               $ 15   $ 15          
Carrying amount of debt instrument               12.4 12.1            
Redemption price of senior preferred stock 2.0 2.1                          
Fair value of debt instrument                   11.7          
Percentage of stock redeemed (in hundredths) 26.70% 22.30%                          
Carrying amount of senior redeemable preferred stock     6.1 8.2                      
Debt Instrument, Interest Rate, Stated Percentage         12.00% 12.00% 6.00%       12.00%        
Public preferred stock par value (in dollar per share)         $ 0.01                    
Public preferred stock                       $ 110.5 $ 108.6 $ 38.2 $ 65.3