Real Estate and Depreciation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Construction related payables	$ 42.9	$ 41.5
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful Life	40 years
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Compensation costs, capitalized	$ 5.5	$ 5.1	$ 3.3
Minimum [Member] | Capital improvements
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Minimum [Member] | Equipment
Property, Plant and Equipment [Line Items]
Useful Life	5 years
Maximum [Member] | Capital improvements
Property, Plant and Equipment [Line Items]
Useful Life	20 years
Maximum [Member] | Equipment
Property, Plant and Equipment [Line Items]
Useful Life	10 years