Schedule III - Real Estate and Accumulated Depreciation (Changes in Accumulated Depreciation Rollforward) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the beginning of period	$ 7.4	$ 5.4	$ 4.0
Additions during the period:
Depreciation expense	8.4	2.0	1.4
Deductions during the period:
Dispositions	0	0	0
Balance at close of period	$ 15.8	$ 7.4	$ 5.4