Noncontrolling Interests Rollforward (Details) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2016		Jun. 30, 2015	May 02, 2016	Mar. 31, 2016	Mar. 31, 2015
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		$ 722,562		$ 55,513		$ 175,785	$ 45,520
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		10,037		391
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest				0
Proceeds from (Payments to) Noncontrolling Interests		21,371		9,428
APIC reclassified for MEP vesting				480
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		(1,504)		(306)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		508,500
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		(1,998)
RE Reclassified for MEP Amortization		4,251
CIVs and Other
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount	[1]	115,383		46,237		94,136	36,549
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	[1]	2,480		260
Proceeds from (Payments to) Noncontrolling Interests	[1]	18,767	[2]	9,428
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		0
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		0
Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		584,081		1,774		68,922	1,949
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		7,557		131
Proceeds from (Payments to) Noncontrolling Interests		2,604
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		(1,504)		(306)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		508,500
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		(1,998)
Management Equity Plan [Member]
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		23,098		7,502		12,727	$ 7,022
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		0		0
Proceeds from (Payments to) Noncontrolling Interests		6,120		0
APIC reclassified for MEP vesting				$ 480
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		0
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		0
RE Reclassified for MEP Amortization		4,251
EnTrustPermal [Member]
Noncontrolling Interest [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value					$ 403,200
EnTrustPermal [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		407,359				0
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		4,159
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		403,200
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		0
Clarion Partners [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		107,544				0
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		2,244
Proceeds from (Payments to) Noncontrolling Interests		0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		0
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		105,300
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		0
RARE Infrastructure, Ltd [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		64,938				67,155
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		1,098
Proceeds from (Payments to) Noncontrolling Interests		0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		(1,317)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		0
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		(1,998)
Royce [Member]
Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest	[3]	23,251				22,202
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	[3]	1,851
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	[3]	(802)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	[3]	0
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange	[3]	0
Other Affiliates [Member] | Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		4,240				$ 1,767
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		56
Proceeds from (Payments to) Noncontrolling Interests		2,604
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		(187)
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value		0
Noncontrolling Interest, Period Increase (Decrease), Foreign Exchange		$ 0

[1] (1) Principally related to VIE and seeded investment products.

[2] (3) Includes $37,093 related to the adoption of updated consolidation accounting guidance further discussed in Note 2.

[3] (2) Related to Royce management equity plan.