Affiliated Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Affiliate Equity [Line Items]
Distributions paid to affiliate partners	$ 99.6	$ 104.6
Payments to acquire interest in affiliates	96.5	15.4
Issuance of interest in affiliates	12.1	$ 9.4
Other assets
Affiliate Equity [Line Items]
Due from affiliates	12.2		$ 14.8
Other liabilities
Affiliate Equity [Line Items]
Due to affiliates	$ 115.1		$ 19.8