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Share and Unit-Based Plans Share and Unit-Based Plans - LTIP Units Granted (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	479,499.000
Average grant date fair value (in dollars per share) | $ / shares	$ 51.03
1/1/2018 | LTIP, Service-based | 12/31/2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	65,466
Average grant date fair value (in dollars per share) | $ / shares	$ 65.68
1/1/2018 | LTIP, Market-based | 12/31/2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	291,326
Average grant date fair value (in dollars per share) | $ / shares	$ 44.28
1/29/2018 | LTIP, Service-based | 12/31/2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	1,893
Average grant date fair value (in dollars per share) | $ / shares	$ 66.02
1/29/2018 | LTIP, Service-based | 2/1/2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	13,632
Average grant date fair value (in dollars per share) | $ / shares	$ 66.02
1/29/2018 | LTIP, Market-based | 12/31/2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	7,775
Average grant date fair value (in dollars per share) | $ / shares	$ 48.23
3/2/2018 | LTIP, Service-based | 3/2/2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	99,407
Average grant date fair value (in dollars per share) | $ / shares	$ 59.04

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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