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Fair Value Measurement - Financial Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Borrowings			$ 202.6	$ 20.6
Level III
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 3,795.1	$ 3,391.7	3,947.2	17,172.0
Initial consolidation of funds		0.0		(14,250.3)
Borrowings		26.4	1,569.0	671.1
Paydowns	(2.3)	(119.4)	(1,896.4)	(369.0)
Deconsolidation of a real estate VIE	(72.6)		(72.6)
Sales		(1.7)		(1.7)
Realized and unrealized (gains) losses, net
Included in earnings	(21.1)	20.6	(46.0)	67.1
Included in other comprehensive income	97.0	36.1	294.9	64.5
Balance, end of period	3,796.1	3,353.7	3,796.1	3,353.7
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date	(24.1)	26.7	(53.5)	58.0
Level III | Loans Payable of Consolidated Funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3,721.2	3,284.7	3,866.3	17,046.7
Initial consolidation of funds		0.0		(14,221.3)
Borrowings		26.4	1,569.0	671.1
Paydowns	(2.3)	(99.0)	(1,881.7)	(331.4)
Deconsolidation of a real estate VIE	0.0		0.0
Sales		0.0		0.0
Realized and unrealized (gains) losses, net
Included in earnings	(21.1)	15.8	(49.4)	43.8
Included in other comprehensive income	97.0	25.5	290.6	44.5
Balance, end of period	3,794.8	3,253.4	3,794.8	3,253.4
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date	(24.1)	19.5	(53.6)	36.6
Level III | Derivative Instruments of Consolidated Funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period		0.3		29.1
Initial consolidation of funds		0.0		(29.0)
Borrowings		0.0		0.0
Paydowns		0.0		0.0
Sales		(1.7)		(1.7)
Realized and unrealized (gains) losses, net
Included in earnings		1.4		1.6
Included in other comprehensive income		0.0		0.0
Balance, end of period		0.0		0.0
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date		0.0		0.0
Level III | Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1.3	25.0	1.5	20.8
Initial consolidation of funds		0.0		0.0
Borrowings		0.0	0.0	0.0
Paydowns	0.0	(10.0)	(0.4)	(10.3)
Deconsolidation of a real estate VIE	0.0		0.0
Sales		0.0		0.0
Realized and unrealized (gains) losses, net
Included in earnings	0.0	(3.7)	0.1	0.8
Included in other comprehensive income	0.0	0.1	0.1	0.1
Balance, end of period	1.3	11.4	1.3	11.4
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date	0.0	0.1	0.1	0.5
Level III | Loans Payable of a real estate VIE
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	72.6	81.7	79.4	75.4
Initial consolidation of funds		0.0		0.0
Borrowings		0.0	0.0	0.0
Paydowns	0.0	(10.4)	(14.3)	(27.3)
Deconsolidation of a real estate VIE	(72.6)		(72.6)
Sales		0.0		0.0
Realized and unrealized (gains) losses, net
Included in earnings	0.0	7.1	3.3	20.9
Included in other comprehensive income	0.0	10.5	4.2	19.9
Balance, end of period	0.0	88.9	0.0	88.9
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date	$ 0.0	$ 7.1	$ 0.0	$ 20.9

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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