Fair Value Measurements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2014 Senior Redeemable Preferred Stock [Member]	Dec. 31, 2013 Senior Redeemable Preferred Stock [Member]	Sep. 30, 2014 Public Preferred Stock [Member]	Dec. 31, 2013 Public Preferred Stock [Member]	Dec. 31, 1991 Public Preferred Stock [Member]	Dec. 31, 1990 Public Preferred Stock [Member]	Sep. 30, 2013 I T Logistics Inc [Member] Subordinated Promissory Note [Member]	Sep. 30, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member] Public Preferred Stock [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Public Preferred Stock [Member]	Sep. 30, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Public Preferred Stock [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Public Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount of debt instrument
Carrying amount of senior redeemable preferred stock	1.9	1.9
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								$ 119.1	$ 116.3	$ 47.0	$ 48.9