Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accrued performance allocations	$ 4,184.2	$ 3,855.6
Partners' capital, common units issued (in shares)		117,840,651
Partners' capital, common units outstanding (in shares)		117,840,651
Common stock, par value (in dollars per share)	$ 0.01
Common stock, authorized (in shares)	100,000,000,000
Common stock, issued (in shares)	353,269,793
Common stock, outstanding (in shares)	353,269,793