v2.4.0.6

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Commitments and Contingencies
Remaining term of operating and ground leases (in years)	89
Future minimum lease obligations under non-cancelable operating and ground leases
2012	$ 17.6
2013	16.5
2014	15.8
2015	14.0
2016	13.9
Thereafter	$ 322.5

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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Represents the remaining term of operating and ground leases.

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