Related Party Transactions Related Party Revenue (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 Sponsors [Member] Family Office Services [Member]	Sep. 30, 2013 Sponsors [Member] Family Office Services [Member]	Sep. 30, 2014 Sponsors [Member] Family Office Services [Member]	Sep. 30, 2013 Sponsors [Member] Family Office Services [Member]	Dec. 31, 2013 Accounts and Notes Receivable, Net [Member] Partners and Shareholders [Member]	Sep. 30, 2014 Third party management and other fees [Member] Sponsors [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Sponsors [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2013 Third party management and other fees [Member] Sponsors [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Sponsors [Member] Property Management Fee Revenue [Member]	Sep. 30, 2013 Third party management and other fees [Member] Sponsors [Member] Property Management Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Sponsors [Member] Property Management Fee Revenue [Member]	Sep. 30, 2013 Third party management and other fees [Member] Sponsors [Member] Property Management Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Equity Method Investee [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2013 Third party management and other fees [Member] Equity Method Investee [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Equity Method Investee [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2013 Third party management and other fees [Member] Equity Method Investee [Member] Supervisory Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Equity Method Investee [Member] Property Management Fee Revenue [Member]	Sep. 30, 2014 Third party management and other fees [Member] Equity Method Investee [Member] Property Management Fee Revenue [Member]	Sep. 30, 2013 Third party management and other fees [Member] Equity Method Investee [Member] Property Management Fee Revenue [Member]	Sep. 30, 2014 Other income and fees [Member] Sponsors [Member] Profit Share [Member]	Sep. 30, 2013 Other income and fees [Member] Sponsors [Member] Profit Share [Member]	Sep. 30, 2014 Other income and fees [Member] Sponsors [Member] Profit Share [Member]	Sep. 30, 2013 Other income and fees [Member] Sponsors [Member] Profit Share [Member]	Sep. 30, 2014 Other income and fees [Member] Sponsors [Member] Other Fees and Disbursements from Non-Controlled Affiliates [Member]	Sep. 30, 2014 Other income and fees [Member] Equity Method Investee [Member] Profit Share [Member]	Sep. 30, 2013 Other income and fees [Member] Equity Method Investee [Member] Profit Share [Member]	Sep. 30, 2014 Other income and fees [Member] Equity Method Investee [Member] Profit Share [Member]	Sep. 30, 2013 Other income and fees [Member] Equity Method Investee [Member] Profit Share [Member]	Sep. 30, 2014 Other income and fees [Member] Equity Method Investee [Member] Other Fees and Disbursements from Non-Controlled Affiliates [Member]	Sep. 30, 2013 Other income and fees [Member] Equity Method Investee [Member] Other Fees and Disbursements from Non-Controlled Affiliates [Member]	Sep. 30, 2014 Other income and fees [Member] Equity Method Investee [Member] Other Fees and Disbursements from Non-Controlled Affiliates [Member]	Sep. 30, 2013 Other income and fees [Member] Equity Method Investee [Member] Other Fees and Disbursements from Non-Controlled Affiliates [Member]	Sep. 30, 2014 Other income and fees [Member] Equity Method Investee [Member] Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member]	Sep. 30, 2013 Other income and fees [Member] Equity Method Investee [Member] Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member]	Sep. 30, 2014 Other income and fees [Member] Equity Method Investee [Member] Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member]	Sep. 30, 2013 Other income and fees [Member] Equity Method Investee [Member] Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.1	$ 0.2	$ 0.1	$ 0.6		$ 0.5	$ 1.6	$ 2.4	$ 0.1	$ 0.2	$ 0.3	$ 1.5	$ 0	$ 0.2	$ 0	$ 0.6	$ 0	$ 0	$ 0.1	$ 0	$ 0.4	$ 0	$ 0.8	$ 0	$ 0	$ 0.1	$ 0	$ 0.4	$ 0	$ 0.4	$ 0	$ 1.1	$ 0	$ 0.4	$ 0	$ 1.1
Due from related parties					$ 0.1