Approximate Number Of Times Simulation Was Run

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- Definition

Award Limit Under First Market Condition

+ References

No definition available.

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- Definition

Award Limit Under Second Market Condition

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No definition available.

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- Definition

Grant Date Fair Value Of Stock Awards

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No definition available.

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- Definition

Share Based Compensation, Arrangement By Share Based Payment Award, Awards Satisfying Market Conditions on Measurement Date

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No definition available.

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- Definition

Share Based Compensation Arrangement, By Share Based Payment Award, Award Vesting Percentage, Unvested as of Date

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No definition available.

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- Definition

Share Based Compensation Arrangement, By Share Based Payment Award, Award Vesting Percentage, Vested as of Date

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No definition available.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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-Name Accounting Principles Board Opinion (APB)

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph g(1)

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-Topic 718

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- Definition

Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

+ References

No definition available.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

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

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Incentive Plan (Class C Profits Interest Units) (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	May 01, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, shares outstanding	128,421,888		128,421,888		125,140,783
Class C Profit Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards satisfying market conditions on measurement date						593,316
Vesting based on market conditions with respect to the first measurement date not achieved			Of the Class C Units that satisfied the market condition on May 1, 2010, 60% vested on May 1, 2010 and the remaining 40% vested ratably each month through June 30, 2012.
Award vesting percentage, vested						60.00%
Award vesting percentage, unvested						40.00%
Approximate number of times simulation was run			100,000
Expected term			36 months
Expected volatility rate			23.00%
Risk-free interest rate			4.60%
Expected dividend rate			5.00%
Award limit, first market condition			$ 17
Award limit, second market condition			40
Common Stock, shares outstanding	69,200,000		69,200,000
Grant date fair value of awards			11.8
Requisite service period of share-based award			5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards satisfying market conditions on measurement date						20,169
Vesting based on market conditions with respect to the first measurement date not achieved			The service conditions of the awards provide for 20% vesting on each of the first and second anniversaries of the grant date and 30% vesting on each of the third and fourth anniversaries of the grant date provided the grantee continues employment on each anniversary date.
Unearned compensation	12.3		12.3		7.4
Capitalized expense related to construction and leasing activities	$ 1.3	$ 0.9	$ 0.7	$ 0.5