Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended												12 Months Ended
	Dec. 31, 2013 property	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions property	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Net income from equity investments	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Net Income (Loss) Attributable to Parent	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Benefit from (provision for) income taxes	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Net income attributable to noncontrolling interest	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Depreciation and amortization	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Real Estate Investment Property, Net	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Other intangible assets	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Other assets	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Total Assets	Dec. 31, 2013 Accounting for income taxes in foreign jurisdictions Accounts payable, accrued expenses and other liabilities	Dec. 31, 2013 BPS Partners, LLC	Oct. 31, 2012 BPS Partners, LLC	Dec. 31, 2013 Maximum Building and related improvements	Dec. 31, 2013 Maximum Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Ownership interest, percentage															15.00%	15.00%
Real estate taxes	$ 23.2	$ 14.1	$ 9.5
Useful lives of properties																	40 years	7 years
Number of real estate properties	352			15
Out-of-period adjustment					(1.7)	(2.9)	(1.8)	0.4	0.2	5.2	4.1	1.7	9.3	(7.7)
Recognized net realized gains (losses) on foreign currency transactions	$ 3.1	$ 1.1	$ 6.0