Common and Preferred Stock and Equity of TRG (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Common Stock [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 450.0
Stock Repurchased and Retired Since Program Inception, shares	4,247,867
Stock Acquired and Retired Since Program Inception, Average Cost Per Share	$ 71.79
Stock Repurchased And Retired, Total Shares Repurchased, Value	$ 304.9
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 145.1
Common Stock, Terms of Conversion	For each share of the Company’s common stock repurchased, one of the Company’s Operating Partnership units was redeemed
Series B Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Convertible Preferred Stock, Issuance In Correlation With Issuance of Partnership Units	one share of Series B Non-Participating Convertible Preferred Stock (Series B Preferred Stock) for each of the Operating Partnership units held by the noncontrolling partners.
Convertible Preferred Stock, Terms of Conversion	ratio of 14,000 shares of Series B Preferred Stock for one share of common stock
Preferred Stock, Voting Rights	Each share of Series B Preferred Stock entitles the holder to one vote on all matters submitted to the Company's shareowners. The holders of Series B Preferred Stock, voting as a class, have the right to designate up to four nominees for election as directors of the Company. On all other matters, including the election of directors, the holders of Series B Preferred Stock will vote with the holders of common stock.
Conversion of Stock, Number of shares of Common Stock issued from the conversion of Series B Preferred Stock	zero	four	one
Conversion of Stock, Shares Converted	15,880	72,061	35,500