The number of annual installments in which the deferred partnerships units will be issued, beginning with the ten year anniversary of the date of exercise (unless Mr. Taubman retires earlier).

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Each PSU represents the right to receive, upon vesting, shares of the Company's common stock as a percentage of the PSU based on the Company's market performance relative to that of a peer group. This element represents the high range of the percentage of the PSU.

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The ratio at which non-option awards granted after the May 2010 amendment are deducted from the shares available for grant.

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The ratio at which non-option awards granted prior to the May 2010 amendment are deducted from the shares available for grant.

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The weighted average period between the balance-sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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Options exercised under unit option deferral election plan

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The number of mature units tendered for the exercise of previously issued stock options under the unit option deferral election plan.

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Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock options and conversion of similar instruments granted under share-based payment arrangements.

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As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met).

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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General descriptive information regarding an arrangement under which employees and directors receive (a) awards of equity shares, equity share options, or other equity instruments or (b) the entity incurs liabilities to them (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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The number of shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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The weighted average fair value as of the grant date of share-based award plans other than stock option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.

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The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant dates pertaining to a share-based award plan other than a stock option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance-sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance-sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Share-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Options [Member]	Jun. 30, 2010 Options [Member]	Jun. 30, 2011 Performance Share Units [Member]	Jun. 30, 2011 Restricted Share Units [Member]	Mar. 31, 2011 Restricted Share Units [Member]	Jun. 30, 2011 Restricted Share Units [Member]
Deferred compensation arrangements [Abstract]
Aggregate number of Company common shares or Operating Partnership units approved for awards under the 2008 Omnibus Plan, amended (in shares)	8,500,000		8,500,000
The ratio at which non-option awards granted after the May 2010 amendment are deducted from the shares available for grant	1.85		1.85
The ratio at which non-option awards granted prior to the May 2010 amendment are deducted from the shares available for grant	2.85		2.85
Share-based compensation, allocation and classification in financial statements [Abstract]
Compensation cost charged to income for the Company's share-based compensation plans	$ 2.2	$ 2.4	$ 4.6	$ 3.9
Compensation cost capitalized as part of properties and deferred leasing costs	0.1	0.1	0.2	0.2
Summary of option activity [Roll Forward]
Outstanding options at beginning of period (in shares)					1,452,781
Outstanding options at end of period (in shares)					1,452,781
Outstanding at beginning of period, weighted average exercise price (in dollars per share)					$ 37.00
Outstanding at end of period, weighted average exercise price (in dollars per share)					$ 37.00
Outstanding at beginning of period, weighted average remaining contractual term (in years)					5.7
Outstanding at end of period, weighted average remaining contractual term (in years)					5.2
Outstanding at beginning of period, range of exercise prices (minimum) (in dollars per share)					$ 13.83
Outstanding at beginning of period, range of exercise prices (maximum) (in dollars per share)					$ 55.90
Outstanding at end of period, range of exercise prices (minimum) (in dollars per share)					$ 13.83
Outstanding at end of period, range of exercise prices (maximum) (in dollars per share)					$ 55.90
Summary of option activity, additional disclosures [Abstract]
Fully vested options, number (in shares)					1,244,452
Fully vested options, weighted average exercise price (in dollars per share)					$ 38.00
Fully vested options, weighted average remaining contractual term (in years)					5.4
Aggregate intrinsic value of in-the-money options outstanding					32.2
Aggregate intrinsic value of in-the-money fully vested options					26.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period					100,000
Total intrinsic value of options exercised during the period						3.9
Cash received from options exercised during the period						3.1
Number of nonvested options outstanding (in shares)					200,000
Employee service share-based compensation, aggregate disclosures [Abstract]
Unrecognized compensation cost related to nonvested awards					$ 0.1		$ 7.4	$ 7.4		$ 7.4
Unrecognized compensation cost related to nonvested awards, weighted average period of recognition (in years)					1		2.1			2.1
Options exercised under unit option deferral election plan (in shares)					3,000,000
The number of mature units tendered for the exercise of previously issued stock options under the unit option deferral election plan (in shares)					2,100,000
The number of units deferred under the unit option deferral election upon the exercise of previously issued stock options (in shares)					900,000
Number of annual installments in which deferred partnership units will be issued (in installments)					10
Summary of non-option activity, additional disclosures [Abstract]
Awards under the 2008 Omnibus Plan							Each PSU represents the right to receive, upon vesting, shares of the Company’s common stock ranging from 0-300% of the PSU based on the Company’s market performance relative to that of a peer group
Right to receive, upon vesting, shares of common stock as a percentage of the PSU, low range (in hundredths)							0.00%
Right to receive, upon vesting, shares of common stock as a percentage of the PSU, high range (in hundredths)							300.00%
Vesting date							3 years
Risk-free interest rate (in hundredths)							1.18%	0.78%	1.18%
Summary of non-option activity [Roll Forward]
Outstanding at beginning of period (in shares)							272,356		617,884	617,884
Granted (in shares)							53,795	1,972	105,391
Redeemed (in shares)										113,684
Forfeited (in shares)										1,484
Outstanding at end of period (in shares)							326,151	610,079		610,079
Outstanding at beginning of period, weighted average grant date fair value (in dollars per share)							$ 28.88		$ 22.72	$ 22.72
Granted, weighted average grant date fair value (in dollars per share)							$ 85.40	$ 53.65	$ 47.98	$ 47.98
Redeemed, weighted average grant date fair value (in dollars per share)										$ 50.21
Forfeited, weighted average grant date fair value (in dollars per share)								$ 18.76		$ 18.76
Outstanding at end of period, weighted average grant date fair value (in dollars per share)							$ 38.20	$ 22.07		$ 22.07