XML 12 R48.htm IDEA: XBRL DOCUMENT v2.4.0.6
Real estate (Details 6) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Real Estate [Abstract]      
Amortization expense related to real estate intangibles $ 3.0 $ 3.1  
Unamortized finite lived intangible assets $ 56.9   $ 59.9