Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified			12 Months Ended		1 Months Ended		1 Months Ended
	Dec. 31, 2012 Class A Common Stock	Dec. 31, 2011 Class A Common Stock	Dec. 31, 2012 Class B Common Stock vote	Dec. 31, 2011 Class B Common Stock	Dec. 31, 2011 JCP	Dec. 31, 2012 JCP	Dec. 31, 2011 JCP Class A Common Stock	Dec. 31, 2011 JCP Preferred Class A
New shares issued							11,000,000	1
Proceeds from issuance of stock					$ 38.5
Investment in company's outstanding common stock					16.60%	16.40%
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, voting rights per share			10
Number of shares received from conversion			1