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Real Estate (Intangible assets) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Real Estate [Abstract]          
Unamortized finite lived intangible assets $ 58.7   $ 58.7   $ 59.9
Finite-lived intangible assets, accumulated amortization 29.3   29.3   49.3
Amortization expense related to real estate intangibles $ 2.3 $ 2.7 $ 8.3 $ 8.7