Disclosure - Partners' Capital (Summary Of Quarterly Distributions Of Available Cash) [Abstract]

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- Definition

Amount of cash distribution paid to unit-holder of limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

Date of record for distribution of cash or unit to limited partner of limited partnership (LP), in YYYY-MM-DD format.

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Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in YYYY-MM-DD format.

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- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

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Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

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Partners' Capital and Non-Controlling Partner (Schedule of Partnership Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions																											12 Months Ended
	Feb. 14, 2022	Feb. 07, 2022	Nov. 12, 2021	Nov. 05, 2021	Aug. 13, 2021	Aug. 06, 2021	May 14, 2021	May 07, 2021	Feb. 12, 2021	Feb. 05, 2021	Nov. 13, 2020	Nov. 06, 2020	Aug. 14, 2020	Aug. 07, 2020	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	Nov. 14, 2019	Nov. 07, 2019	Aug. 14, 2019	Aug. 07, 2019	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date				Nov. 05, 2021		Aug. 06, 2021		May 07, 2021		Feb. 05, 2021		Nov. 06, 2020		Aug. 07, 2020		May 08, 2020		Feb. 07, 2020		Nov. 07, 2019		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019
Distribution to limited partner, distribution date			Nov. 12, 2021		Aug. 13, 2021		May 14, 2021		Feb. 12, 2021		Nov. 13, 2020		Aug. 14, 2020		May 15, 2020		Feb. 14, 2020		Nov. 14, 2019		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019
Distribution Made to Limited Partner, Distributions Paid, Per Unit			$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.60		$ 0.60		$ 0.60		$ 0.60
Distribution amount			$ 39.3		$ 39.3		$ 39.3		$ 46.4		$ 46.0		$ 45.7		$ 45.7		$ 45.3		$ 43.1		$ 43.1		$ 43.1		$ 43.1		$ 164.3	$ 182.7	$ 172.4
Cash distribution \| Subsequent Event
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date		Feb. 07, 2022
Distribution declared per limited partner unit	$ 0.625