Capital Accounts, Redeemable Preferred Limited Partner Interests (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Temporary Equity [Line Items]
Treasury units outstanding (preferred units) (in units)	855,915	855,915
Treasury units outstanding (common units) (in units)				54,807,352
Treasury units	$ 1,297.3	$ 1,297.3		$ 0.0
Series A cumulative convertible preferred units (in dollars per unit)	$ 1,000	$ 1,000
Series A cumulative convertible preferred units issued (in units)	50,000	50,000
Net cash proceeds from the issuance of preferred units		$ 32.5	$ 0.0
Common units exchanged for preferred units, with common units received being immediately cancelled	$ 17.5	17.5
Total offering price for redeemable noncontrolling interests		$ 50.0
Common units exchanged for preferred units in September 2020, with the common units received being immediately cancelled (in units)	1,120,588	1,120,588
Preferred unit distribution rate		7.25%
Redemption price per preferred unit after September 30, 2025 at unitholder election (in dollars per unit)		$ 1,000
Redemption price per preferred unit from September 30, 2020 through September 29, 2022 (in dollars per unit)		1,100
Redemption price per preferred unit from September 30, 2022 through September 29, 2024 (in dollars per unit)		1,070
Redemption price per preferred unit from September 30, 2024 through September 29, 2025 (in dollars per unit)		1,030
Redemption price per preferred unit from September 30, 2026 through September 29, 2026 (in dollars per unit)		1,010
Redemption price per preferred unit on or after September 30, 2026 (in dollars per unit)		1,000
Redemption price per preferred unit if Change of Control event occurs (in dollars per unit)		$ 1,010
Percentage applied to the common unit market price in calculating the number of common units to be acquired upon the conversion of series A preferred units to common units		92.50%
Percentage of preferred units that may be converted into common units at unitholder option		50.00%
EPCO and its privately held affiliates [Member]
Temporary Equity [Line Items]
Series A cumulative convertible preferred units issued (in units)	15,000	15,000
Net cash proceeds from the issuance of preferred units		$ 15.0