Contingent Consideration - Changes in Contingent Consideration Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Loss Contingency Accrual [Roll Forward]
Balance, beginning of period	$ 103.1	$ 354.2	$ 310.6	$ 384.6
Change in carrying value	(2.9)	(18.8)	(14.5)	(42.5)
Payments	(10.0)	(21.3)	(85.9)	(25.8)
Conversion to note payable			(120.0)
Issuance of equity				(2.2)
Balance, end of period	90.2	314.1	90.2	314.1
Contingent cash and other consideration payable to non- Carlyle personnel
Loss Contingency Accrual [Roll Forward]
Balance, beginning of period	47.0	224.1	221.5	201.0
Change in carrying value	(1.3)	(7.8)	7.5	16.5
Payments	(0.7)	(1.1)	(64.0)	(2.3)
Conversion to note payable			(120.0)
Issuance of equity				0.0
Balance, end of period	45.0	215.2	45.0	215.2
Contingent cash consideration | Amounts payable to the sellers who are Carlyle professionals | Performance-based
Loss Contingency Accrual [Roll Forward]
Balance, beginning of period	9.2	28.5	8.7	26.8
Change in carrying value	0.1	0.2	0.6	1.9
Payments	(9.3)	(20.2)	(9.3)	(20.2)
Conversion to note payable			0.0
Issuance of equity				0.0
Balance, end of period	0.0	8.5	0.0	8.5
Contingent cash consideration | Amounts payable to the sellers who are Carlyle professionals | Employment-based
Loss Contingency Accrual [Roll Forward]
Balance, beginning of period	46.9	101.6	80.4	156.8
Change in carrying value	(1.7)	(11.2)	(22.6)	(60.9)
Payments	0.0	0.0	(12.6)	(3.3)
Conversion to note payable			0.0
Issuance of equity				(2.2)
Balance, end of period	$ 45.2	$ 90.4	$ 45.2	$ 90.4