Fair Value Measurements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended			12 Months Ended		12 Months Ended						12 Months Ended
	Aug. 24, 2012 Senior Redeemable Preferred Stock [Member]	May 16, 2012 Senior Redeemable Preferred Stock [Member]	Apr. 08, 2011 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2012 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2011 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2012 Public Preferred Stock [Member]	Dec. 31, 2011 Public Preferred Stock [Member]	Dec. 31, 1991 Public Preferred Stock [Member]	Dec. 31, 1990 Public Preferred Stock [Member]	Dec. 31, 2011 I T Logistics Inc [Member]	Jun. 30, 2011 I T Logistics Inc [Member]	Dec. 31, 2012 I T Logistics Inc [Member] Subordinated Promissory Note [Member]	Dec. 31, 2011 I T Logistics Inc [Member] Subordinated Promissory Note [Member]	Jun. 30, 2011 I T Logistics Inc [Member] Subordinated Promissory Note [Member]	Dec. 31, 2011 I T Logistics Inc [Member] Liability Due in Installments [Member]	Dec. 31, 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]	Dec. 31, 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	$ 7
Outstanding balance on Notes Payable												0			3.5
Accretion period of notes payable										60 months
Carrying amount of debt instrument													12.1
Prepayment discount (in hundredths)												50.00%
Redemption price of senior preferred stock	2.0	2.0	2.1
Fair value of debt instrument										11.7	6.9
Percentage of stock redeemed (in hundredths)	36.00%	26.70%	22.30%
Carrying amount of senior redeemable preferred stock				4.0	8.2
Preferred stock dividend rate per annum (in hundredths)				14.125%		12.00%	12.00%	6.00%	6.00%
Public preferred stock par value (in dollar per share)						$ 0.01
Public preferred stock																$ 112.5	$ 108.6	$ 47.8	$ 65.3