Annual report pursuant to Section 13 and 15(d)

Accounting Policies Real Estate and Depreciation, In-place Leases (Details)

v2.4.0.6
Accounting Policies Real Estate and Depreciation, In-place Leases (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2015
Leases, Acquired-in-Place [Member]
Dec. 31, 2014
Leases, Acquired-in-Place [Member]
Dec. 31, 2013
Leases, Acquired-in-Place [Member]
Dec. 31, 2012
Leases, Acquired-in-Place [Member]
Dec. 31, 2011
Leases, Acquired-in-Place [Member]
Dec. 31, 2011
Leases, Acquired-in-Place, Tenant Origination Costs [Member]
Dec. 31, 2010
Leases, Acquired-in-Place, Tenant Origination Costs [Member]
Dec. 31, 2011
Leases, Acquired-in-Place, Leasing Commissions and Absorbtion Costs [Member]
Dec. 31, 2010
Leases, Acquired-in-Place, Leasing Commissions and Absorbtion Costs [Member]
Dec. 31, 2011
Leases, Acquired-in-Place, Net Lease Intangible Assets [Member]
Dec. 31, 2010
Leases, Acquired-in-Place, Net Lease Intangible Assets [Member]
Dec. 31, 2011
Leases, Acquired-in-Place, Below-Market Ground Lease [Member]
Dec. 31, 2010
Leases, Acquired-in-Place, Below-Market Ground Lease [Member]
Finite-Lived Intangible Assets [Line Items]                                
Finite-Lived Intangible Assets, Gross Carrying Value                 $ 55.7 $ 40.5 $ 86.7 $ 58.0 $ 14.5 $ 7.6 $ 12.1 $ 12.1
Finite-Lived Intangible Assets, Accumulated Amortization                 25.5 19.6 34.8 24.9 5.7 4.3 0.8 0.6
Finite-Lived Intangible Assets, Net                 30.2 20.9 51.9 33.1 8.8 3.3 11.3 11.5
Finite-lived Intangible Liabilities, Net Lease, Gross 32.0 29.8                            
Finite-lived Intangible Liabilities, Net Lease, Accumulated Amortization 19.3 16.1                            
Finite-lived Intangible Liabilities, Net Lease, Net 12.7 13.7                            
Amortization 15.4 7.7 7.3                          
2012               19.4                
2013             15.8                  
2014           13.7                    
2015         11.3                      
2016       $ 8.2