Related Party Transactions Reimbursement of Pre-Closing Transaction Costs (Details) (Pre-Closing Transaction Costs [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Investor [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 103.8
Senior Management and Certain Directors [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	180.0
Malkin Group [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 38.9