Accounting Policies Real Estate and Depreciation, In-place Leases (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2015
Leases, Acquired-in-Place [Member]
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Dec. 31, 2014
Leases, Acquired-in-Place [Member]
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Dec. 31, 2013
Leases, Acquired-in-Place [Member]
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Dec. 31, 2012
Leases, Acquired-in-Place [Member]
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Dec. 31, 2011
Leases, Acquired-in-Place [Member]
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Dec. 31, 2011
Leases, Acquired-in-Place, Tenant Origination Costs [Member]
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Dec. 31, 2010
Leases, Acquired-in-Place, Tenant Origination Costs [Member]
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Dec. 31, 2011
Leases, Acquired-in-Place, Leasing Commissions and Absorbtion Costs [Member]
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Dec. 31, 2010
Leases, Acquired-in-Place, Leasing Commissions and Absorbtion Costs [Member]
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Dec. 31, 2011
Leases, Acquired-in-Place, Net Lease Intangible Assets [Member]
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Dec. 31, 2010
Leases, Acquired-in-Place, Net Lease Intangible Assets [Member]
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Dec. 31, 2011
Leases, Acquired-in-Place, Below-Market Ground Lease [Member]
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Dec. 31, 2010
Leases, Acquired-in-Place, Below-Market Ground Lease [Member]
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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 |