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Significant Accounting Policies (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes
Minimum annual taxable income distributed to stockholders to maintain REIT qualification (as a percent)			90.00%
Federal, state and local tax provision	$ 2.3	$ 0.1	$ 3.9
Estimated tax payments	0	0	0.1	0
Maximum
Income Taxes
Federal, state and local tax provision				$ 0.1

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.