Dispositions, Acquisition, and Developments	9 Months Ended
Sep. 30, 2015
Dispositions, Acquisition, and Development [Abstract]
Dispositions Acquisition, and Development [Text Block]	Dispositions, Acquisition, and Developments Dispositions Sale of Centers to Starwood In October 2014, the Company completed the disposition of a portfolio of seven centers to an affiliate of the Starwood Capital Group (Starwood). The following centers were sold: MacArthur Center in Norfolk, Virginia, Stony Point Fashion Park in Richmond, Virginia, Northlake Mall in Charlotte, North Carolina, The Mall at Wellington Green in Wellington, Florida, The Shops at Willow Bend in Plano, Texas, The Mall at Partridge Creek in Clinton Township, Michigan, and Fairlane Town Center in Dearborn, Michigan. The results of the seven centers are in the Company's continuing operations for all periods prior to the October 2014 sale, pursuant to the Company's previous adoption of Accounting Standards Update (ASU) No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" beginning January 1, 2014. The Company incurred expenses of $5.5 million, $5.2 million at TRG's beneficial share, for the nine months ended September 30, 2014 related to the discontinuation of hedge accounting on the swap previously designated to hedge the MacArthur Center note payable (Note 8). Expenses incurred during the three months ended September 30, 2014 related to the discontinuation of hedge accounting were immaterial. The Company also incurred disposition costs of $0.5 million and $1.0 million for the three and nine months ended September 30, 2014, respectively, related to the sale of the centers to Starwood. These expenses are classified as Nonoperating Income (Expense) on the Consolidated Statement of Operations and Comprehensive Income. As a result of the sale, the Company underwent a restructuring plan to reduce its workforce across various areas of the organization during the third quarter of 2014. As of September 30, 2014, the Company had incurred $3.0 million of expenses related to the reduction in workforce. These expenses are classified as Restructuring Charge on the Consolidated Statement of Operations and Comprehensive Income. As of September 30, 2015, substantially all of the restructuring costs have been paid. International Plaza In January 2014, the Company sold a total of 49.9% of the Company's interests in the entity that owns International Plaza, including certain governance rights, for $499 million (excluding transaction costs), which consisted of $337 million of cash and approximately $162 million of beneficial interest in debt. The Company's ownership in the center decreased to a noncontrolling 50.1% interest, which is accounted for under the equity method subsequent to the disposition. During 2014, a gain of $368 million (net of tax of $9.7 million) was recognized as a result of the sale. During the three months ended September 30, 2015, an adjustment of $0.4 million was made, reducing the tax recognized as a result of the sale. Arizona Mills/Oyster Bay In January 2014, the Company completed the sale of its 50% interest in Arizona Mills, an Unconsolidated Joint Venture, and land in Syosset, New York related to the former Oyster Bay project, to Simon Property Group (SPG). The consideration, excluding transaction costs, consisted of $60 million of cash and 555,150 partnership units in Simon Property Group Limited Partnership. The number of partnership units received was determined based on a value of $154.91 per unit. The fair value of the partnership units recognized for accounting purposes was $77.7 million, after considering the one-year restriction on the sale of these partnership units (Note 12). The number of partnership units subsequently increased to 590,124, in lieu of the Company's participation in a distribution of certain partnership units of another entity by SPG and Simon Property Group Limited Partnership. The increase in the number of partnership units was neutral to the market value of the Company's holdings as of the transaction date. The Company's investment in the partnership units is classified within Deferred Charges and Other Assets on the Consolidated Balance Sheet. As a result of the sale, the Company was relieved of its $84 million share of the $167 million mortgage loan outstanding on Arizona Mills at the time of the sale. A gain of $109 million was recognized as a result of the transaction. Acquisition Purchase of U.S. Headquarters Building In February 2014, the Company purchased the U.S. headquarters building located in Bloomfield Hills, Michigan for approximately $16.1 million from an affiliate of the Taubman family. In exchange for the building, the Company assumed the $17.4 million, 5.90% fixed rate loan on the building, issued 1,431 Operating Partnership units (and a corresponding number of shares of Series B Preferred Stock), and received $1.4 million in escrowed and other cash from the affiliate. In March 2015, the Company refinanced the loan on the building (Note 5). U.S. Development International Market Place International Market Place, a 0.4 million square foot center, is under construction in Waikiki, Honolulu, Hawaii. The center will be anchored by Saks Fifth Avenue and is expected to open in August 2016. The Company owns a 93.5% interest in the project, which is subject to a participating ground lease. As of September 30, 2015, the Company's capitalized costs for the project were $216.7 million ($203.1 million at TRG's share). The Mall of San Juan The Mall of San Juan, a 0.6 million square foot center in San Juan, Puerto Rico, opened in March 2015. The center is anchored by Nordstrom and Saks Fifth Avenue. As of September 30, 2015, the Company owned a 95% interest in the center subsequent to the acquisition of an additional 15% interest in April 2015. The additional interest was acquired at cost. In connection with the acquisition, the noncontrolling owner used $9.3 million of previously contributed capital to fund its obligation to reimburse the Company for certain shared infrastructure costs, which was classified as a reduction of the Noncontrolling interests and an offsetting reduction of Properties on the Consolidated Balance Sheet (Note 14). Asia Development CityOn.Xi'an The Company has a joint venture with Beijing Wangfujing Department Store (Group) Co., Ltd (Wangfujing), one of China's largest department store chains, which will own a 60% controlling interest in and manage an approximately 1.0 million square foot shopping center, CityOn.Xi'an, to be located at Xi'an Saigao City Plaza, a large-scale mixed-use development under construction in Xi'an, China. Through this joint venture, the Company will beneficially own a 30% interest in the shopping center, which is scheduled to open in spring 2016. As of September 30, 2015, the Company's share of total project costs were $93.8 million, as decreased by $1.8 million for the change in exchange rates. This investment is classified within Investment in Unconsolidated Joint Ventures on the Consolidated Balance Sheet. CityOn.Zhengzhou The Company also has a second joint venture with Wangfujing which owns a majority interest in and will manage an approximately 1.0 million square foot multi-level shopping center, CityOn.Zhengzhou, under construction in Zhengzhou, China. Through this joint venture, the Company beneficially owns a 32% interest in the shopping center, which is scheduled to open in fall 2016. As of September 30, 2015, the Company's share of total project costs were $58.1 million, as decreased by $1.2 million for the change in exchange rates. This investment is classified within Investment in Unconsolidated Joint Ventures on the Consolidated Balance Sheet. Hanam Union Square The Company's joint venture with Shinsegae Group, South Korea's largest retailer, is developing an approximately 1.7 million square foot shopping center, Hanam Union Square, under construction in Hanam, Gyeonggi Province, South Korea, which is scheduled to open in early fall 2016. The Company has partnered with a major institution in Asia for a 49% ownership interest in Hanam Union Square. The institutional partner owns 14.7% of the project, bringing the Company's effective ownership to 34.3%. As of September 30, 2015, the Company's share of total project costs were $203.3 million, as decreased by $13.7 million for the change in exchange rates. This investment is classified within Investment in Unconsolidated Joint Ventures on the Consolidated Balance Sheet.

Dispositions, Acquisition, and Developments

Dispositions

Sale of Centers to Starwood

In October 2014, the Company completed the disposition of a portfolio of seven centers to an affiliate of the Starwood Capital Group (Starwood). The following centers were sold: MacArthur Center in Norfolk, Virginia, Stony Point Fashion Park in Richmond, Virginia, Northlake Mall in Charlotte, North Carolina, The Mall at Wellington Green in Wellington, Florida, The Shops at Willow Bend in Plano, Texas, The Mall at Partridge Creek in Clinton Township, Michigan, and Fairlane Town Center in Dearborn, Michigan. The results of the seven centers are in the Company's continuing operations for all periods prior to the October 2014 sale, pursuant to the Company's previous adoption of Accounting Standards Update (ASU) No. 2014-08, "Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity" beginning January 1, 2014.

The Company incurred expenses of $5.5 million, $5.2 million at TRG's beneficial share, for the nine months ended September 30, 2014 related to the discontinuation of hedge accounting on the swap previously designated to hedge the MacArthur Center note payable (Note 8). Expenses incurred during the three months ended September 30, 2014 related to the discontinuation of hedge accounting were immaterial. The Company also incurred disposition costs of $0.5 million and $1.0 million for the three and nine months ended September 30, 2014, respectively, related to the sale of the centers to Starwood. These expenses are classified as Nonoperating Income (Expense) on the Consolidated Statement of Operations and Comprehensive Income.

As a result of the sale, the Company underwent a restructuring plan to reduce its workforce across various areas of the organization during the third quarter of 2014. As of September 30, 2014, the Company had incurred $3.0 million of expenses related to the reduction in workforce. These expenses are classified as Restructuring Charge on the Consolidated Statement of Operations and Comprehensive Income. As of September 30, 2015, substantially all of the restructuring costs have been paid.

International Plaza

In January 2014, the Company sold a total of 49.9% of the Company's interests in the entity that owns International Plaza, including certain governance rights, for $499 million (excluding transaction costs), which consisted of $337 million of cash and approximately $162 million of beneficial interest in debt. The Company's ownership in the center decreased to a noncontrolling 50.1% interest, which is accounted for under the equity method subsequent to the disposition. During 2014, a gain of $368 million (net of tax of $9.7 million) was recognized as a result of the sale. During the three months ended September 30, 2015, an adjustment of $0.4 million was made, reducing the tax recognized as a result of the sale.

Arizona Mills/Oyster Bay

In January 2014, the Company completed the sale of its 50% interest in Arizona Mills, an Unconsolidated Joint Venture, and land in Syosset, New York related to the former Oyster Bay project, to Simon Property Group (SPG). The consideration, excluding transaction costs, consisted of $60 million of cash and 555,150 partnership units in Simon Property Group Limited Partnership. The number of partnership units received was determined based on a value of $154.91 per unit. The fair value of the partnership units recognized for accounting purposes was $77.7 million, after considering the one-year restriction on the sale of these partnership units (Note 12). The number of partnership units subsequently increased to 590,124, in lieu of the Company's participation in a distribution of certain partnership units of another entity by SPG and Simon Property Group Limited Partnership. The increase in the number of partnership units was neutral to the market value of the Company's holdings as of the transaction date. The Company's investment in the partnership units is classified within Deferred Charges and Other Assets on the Consolidated Balance Sheet. As a result of the sale, the Company was relieved of its $84 million share of the $167 million mortgage loan outstanding on Arizona Mills at the time of the sale. A gain of $109 million was recognized as a result of the transaction.

Acquisition

Purchase of U.S. Headquarters Building

In February 2014, the Company purchased the U.S. headquarters building located in Bloomfield Hills, Michigan for approximately $16.1 million from an affiliate of the Taubman family. In exchange for the building, the Company assumed the $17.4 million, 5.90% fixed rate loan on the building, issued 1,431 Operating Partnership units (and a corresponding number of shares of Series B Preferred Stock), and received $1.4 million in escrowed and other cash from the affiliate. In March 2015, the Company refinanced the loan on the building (Note 5).

U.S. Development

International Market Place

International Market Place, a 0.4 million square foot center, is under construction in Waikiki, Honolulu, Hawaii. The center will be anchored by Saks Fifth Avenue and is expected to open in August 2016. The Company owns a 93.5% interest in the project, which is subject to a participating ground lease. As of September 30, 2015, the Company's capitalized costs for the project were $216.7 million ($203.1 million at TRG's share).

The Mall of San Juan

The Mall of San Juan, a 0.6 million square foot center in San Juan, Puerto Rico, opened in March 2015. The center is anchored by Nordstrom and Saks Fifth Avenue. As of September 30, 2015, the Company owned a 95% interest in the center subsequent to the acquisition of an additional 15% interest in April 2015. The additional interest was acquired at cost. In connection with the acquisition, the noncontrolling owner used $9.3 million of previously contributed capital to fund its obligation to reimburse the Company for certain shared infrastructure costs, which was classified as a reduction of the Noncontrolling interests and an offsetting reduction of Properties on the Consolidated Balance Sheet (Note 14).

Asia Development

CityOn.Xi'an

The Company has a joint venture with Beijing Wangfujing Department Store (Group) Co., Ltd (Wangfujing), one of China's largest department store chains, which will own a 60% controlling interest in and manage an approximately 1.0 million square foot shopping center, CityOn.Xi'an, to be located at Xi'an Saigao City Plaza, a large-scale mixed-use development under construction in Xi'an, China. Through this joint venture, the Company will beneficially own a 30% interest in the shopping center, which is scheduled to open in spring 2016. As of September 30, 2015, the Company's share of total project costs were $93.8 million, as decreased by $1.8 million for the change in exchange rates. This investment is classified within Investment in Unconsolidated Joint Ventures on the Consolidated Balance Sheet.

CityOn.Zhengzhou

The Company also has a second joint venture with Wangfujing which owns a majority interest in and will manage an approximately 1.0 million square foot multi-level shopping center, CityOn.Zhengzhou, under construction in Zhengzhou, China. Through this joint venture, the Company beneficially owns a 32% interest in the shopping center, which is scheduled to open in fall 2016. As of September 30, 2015, the Company's share of total project costs were $58.1 million, as decreased by $1.2 million for the change in exchange rates. This investment is classified within Investment in Unconsolidated Joint Ventures on the Consolidated Balance Sheet.

Hanam Union Square

The Company's joint venture with Shinsegae Group, South Korea's largest retailer, is developing an approximately 1.7 million square foot shopping center, Hanam Union Square, under construction in Hanam, Gyeonggi Province, South Korea, which is scheduled to open in early fall 2016. The Company has partnered with a major institution in Asia for a 49% ownership interest in Hanam Union Square. The institutional partner owns 14.7% of the project, bringing the Company's effective ownership to 34.3%. As of September 30, 2015, the Company's share of total project costs were $203.3 million, as decreased by $13.7 million for the change in exchange rates. This investment is classified within Investment in Unconsolidated Joint Ventures on the Consolidated Balance Sheet.