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

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Date of record for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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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 (Schedule of Partnership Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions																											12 Months Ended
	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	Nov. 14, 2018	Nov. 07, 2018	Aug. 14, 2018	Aug. 07, 2018	May 15, 2018	May 08, 2018	Feb. 14, 2018	Feb. 07, 2018	Nov. 14, 2017	Nov. 07, 2017	Aug. 14, 2017	Aug. 07, 2017	May 15, 2017	May 08, 2017	Feb. 14, 2017	Feb. 07, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date				Nov. 07, 2019		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019		Nov. 07, 2018		Aug. 07, 2018		May 08, 2018		Feb. 07, 2018		Nov. 07, 2017		Aug. 07, 2017		May 08, 2017		Feb. 07, 2017
Distribution to limited partner, distribution date			Nov. 14, 2019		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019		Nov. 14, 2018		Aug. 14, 2018		May 15, 2018		Feb. 14, 2018		Nov. 14, 2017		Aug. 14, 2017		May 15, 2017		Feb. 14, 2017
Distribution Made to Limited Partner, Distributions Paid, Per Unit			$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60
Distribution amount			$ 43.1		$ 43.1		$ 43.1		$ 43.1		$ 42.7		$ 42.7		$ 42.7		$ 42.7		$ 42.2		$ 41.8		$ 41.8		$ 41.8		$ 172.4	$ 170.8	$ 167.6
Cash distribution \| Subsequent Event
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date		Feb. 07, 2020
Distribution to limited partner, distribution date	Feb. 14, 2020
Distribution declared per limited partner unit	$ 0.625