Commitments and Contingencies Commitments and Contingencies related to Acquisitions (Details) £ in Thousands, AUD in Thousands, $ in Thousands		3 Months Ended	12 Months Ended
		Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2016 AUD	Jun. 30, 2016 GBP (£)	Jun. 30, 2016 USD ($)		Dec. 31, 2015 USD ($)	Oct. 21, 2015 USD ($)		May 05, 2015 GBP (£)	May 05, 2015 USD ($)	Mar. 31, 2015 USD ($)	Oct. 01, 2014 USD ($)	May 30, 2014 USD ($)
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			$ 84,585			$ 62,923							$ 110,784
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability			27,457
Business Combination, Contingent Consideration, Liability, Current						13,353
Business Combination, Contingent Consideration, Liability, Noncurrent						49,570
Business Acquisition, Preacquisition Contingency, Amount of Settlement			(22,765)
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	[1]					568,220
RARE Infrastructure, Ltd [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			27,145			26,465			$ 25,000	[2]			0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability	[3]								$ 25,000
Business Combination, Contingent Consideration, Liability, Current						6,794
Business Combination, Contingent Consideration, Liability, Noncurrent						19,671
Business Acquisition, Preacquisition Contingency, Amount of Settlement			0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				AUD 106,000		78,911	[1]
Martin Currie [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			41,222			20,181							70,114	$ 75,211
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability			0
Business Combination, Contingent Consideration, Liability, Current						0
Business Combination, Contingent Consideration, Liability, Noncurrent						20,181
Business Acquisition, Preacquisition Contingency, Amount of Settlement			0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ 21,041
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					£ 325,000	430,349	[1]
PK Investments [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			2,469			2,477							0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability	[3]							$ 2,457
Business Combination, Contingent Consideration, Liability, Current						0
Business Combination, Contingent Consideration, Liability, Noncurrent						2,477
Business Acquisition, Preacquisition Contingency, Amount of Settlement			0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	[1]					2,477
QS Investors [Domain]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			13,749			13,800							13,553		$ 13,370
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability			0
Business Combination, Contingent Consideration, Liability, Current						6,559
Business Combination, Contingent Consideration, Liability, Noncurrent						7,241
Business Acquisition, Preacquisition Contingency, Amount of Settlement			0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High						30,000
Fauchier [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration, Liability			0			0							$ 27,117
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability			0
Business Combination, Contingent Consideration, Liability, Current						0
Business Combination, Contingent Consideration, Liability, Noncurrent						0
Business Acquisition, Preacquisition Contingency, Amount of Settlement											£ 15,000	$ 22,765
Other changes in Fair Value [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(3,662)	2,484
Other changes in Fair Value [Member] | RARE Infrastructure, Ltd [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(680)	2,145
Other changes in Fair Value [Member] | Martin Currie [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(3,041)	(531)
Other changes in Fair Value [Member] | PK Investments [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		8	12
Other changes in Fair Value [Member] | QS Investors [Domain]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		51	196
Other changes in Fair Value [Member] | Fauchier [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		0	662
Change in Input Assumptions [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		(18,000)	(33,375)
Change in Input Assumptions [Member] | Martin Currie [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability		$ (18,000)	(28,361)
Change in Input Assumptions [Member] | Fauchier [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			$ (5,014)
Contingent payment due on fourth anniversary of acquisition [Member] | QS Investors [Domain]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High						20,000
Contingent payment due on fourth anniversary of acquisition [Member] | Fauchier [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High					£ 20,000	$ 26,483	[1]

[1] Using the applicable exchange rate as of June 30, 2016, for amounts denominated in currencies other than the U.S. dollar.

[2] (1)Post combination EnTrustPermal noncontrolling interest of $403,200 also includes a fair value reclassification of $15,500 from retained earnings

[3] Using the applicable exchange rate on the date of acquisition for amounts denominated in currencies other than the U.S. dollar.