Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended		9 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Sep. 27, 2010 Predecessor	Dec. 31, 2010 Predecessor Maximum	Dec. 31, 2012 Buildings Minimum	Dec. 31, 2012 Buildings Maximum	Dec. 31, 2012 Building improvements Minimum	Dec. 31, 2012 Building improvements Maximum
Investments in Real Estate
Capitalized interest costs		$ 1.8	$ 1.6	$ 0.5	$ 0.1
Useful lives						27 years	40 years	1 year	15 years
Depreciation expense	$ 7.4	$ 42.3	$ 33.7	$ 9.6