Notes, Mortgage Notes and Obligations Payable - Notes, Mortgage Notes and Obligations Payable (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Senior Notes [Member] 8.5% Notes [Member]	Dec. 31, 2011 Senior Notes [Member] 8.5% Notes [Member]	Apr. 26, 2011 Senior Notes [Member] 8.5% Notes [Member]	Dec. 31, 2012 Senior Notes [Member] 10% Notes [Member]	Dec. 31, 2011 Senior Notes [Member] 10% Notes [Member]	Dec. 31, 2010 Senior Notes [Member] 10% Notes [Member]	Dec. 31, 2012 Loans Payable [Member] Term Loan Facility [Member]	Dec. 31, 2011 Loans Payable [Member] Term Loan Facility [Member]	Dec. 31, 2012 Mortgages [Member]	Dec. 31, 2011 Mortgages [Member]	Dec. 31, 2012 Notes Payable, Other Payables [Member]	Dec. 31, 2011 Notes Payable, Other Payables [Member]	Dec. 31, 2012 Revolving Credit Facility [Member]	Dec. 31, 2011 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 1,100.3	$ 1,143.2	$ 743.2	$ 493.1		$ 250.0	$ 250.0		$ 91.3	$ 339.9	$ 1.8	$ 2.1	$ 14.0	$ 16.1	$ 0	$ 42.0
Current maturities of long-term debt	2.4	32.1
Notes, Mortgage Notes and Obligations Payable, Less Current Maturities	1,097.9	1,111.1
Unamortized discount (premium), net			$ (8.2)	$ 6.9					$ 1.7	$ 7.5	$ 0.2	$ 0.3	$ 1.0	$ 1.6
Interest rate			8.50%	8.50%	8.50%	10.00%		10.00%