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Noncontrolling Interests - Changes in Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 29, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance		$ 34,144	$ 0
Assumed through			513,847
Distributions and redemptions		(503,054)	(879,889)	$ (621,207)
Net income (loss)		(3,708)	23,543	0
Ending balance		9,385	34,144	$ 0
Redeemable noncontrolling interests
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions		354	8,550
Distributions and redemptions		(21,405)	(100,830)
Net income (loss)		(3,708)	23,543
Currency translation adjustment and other		0	(725)
Redeemable noncontrolling interests | Townsend
Increase (Decrease) in Temporary Equity [Roll Forward]
Assumed through		0	78,843
Redeemable noncontrolling interests | Consolidated open-end fund
Increase (Decrease) in Temporary Equity [Roll Forward]
Assumed through		$ 0	$ 24,763
Townsend
Noncontrolling Interest [Line Items]
Proceeds from sale of interest, allocated	$ 20,000

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount of increase in noncontrolling interest from a business combination.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to noncontrolling interests.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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