Share and Unit-based Plans - Schedule of LTIP Grants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
LTIP units
Share and unit-based plans
Granted (shares)	343,431	569,136	506,906
Granted (in dollars per share)	$ 32.40	$ 51.78	$ 55.33
Service-based
Share and unit-based plans
Granted (shares)	343,431	569,136	506,906
January 1, 2017 | Service-based | First vesting period
Share and unit-based plans
Granted (shares)			66,079
Granted (in dollars per share)			$ 70.84
January 1, 2017 | Market-indexed | First vesting period
Share and unit-based plans
Granted (shares)			297,849
Granted (in dollars per share)			$ 47.15
March 3, 2017 | Service-based | Second vesting period
Share and unit-based plans
Granted (shares)			134,742
Granted (in dollars per share)			$ 66.57
June 1, 2017 | Service-based | Third vesting period
Share and unit-based plans
Granted (shares)			1,522
Granted (in dollars per share)			$ 58.31
June 1, 2017 | Market-indexed | Third vesting period
Share and unit-based plans
Granted (shares)			6,714
Granted (in dollars per share)			$ 39.66
January 1, 2018 | Service-based | First vesting period
Share and unit-based plans
Granted (shares)		65,466
Granted (in dollars per share)		$ 65.68
January 1, 2018 | Market-indexed | First vesting period
Share and unit-based plans
Granted (shares)		291,326
Granted (in dollars per share)		$ 44.28
January 29, 2018 | Service-based | First vesting period
Share and unit-based plans
Granted (shares)		1,893
Granted (in dollars per share)		$ 66.02
January 29, 2018 | Service-based | Second vesting period
Share and unit-based plans
Granted (shares)		13,632
Granted (in dollars per share)		$ 66.02
January 29, 2018 | Market-indexed | First vesting period
Share and unit-based plans
Granted (shares)		7,775
Granted (in dollars per share)		$ 48.23
March 2, 2018 | Service-based | Third vesting period
Share and unit-based plans
Granted (shares)		99,407
Granted (in dollars per share)		$ 59.04
April 26, 2018 | Service-based | Fourth vesting period
Share and unit-based plans
Granted (shares)		89,637
Granted (in dollars per share)		$ 55.78
January 1, 2019 | Service-based | First vesting period
Share and unit-based plans
Granted (shares)	81,732
Granted (in dollars per share)	$ 43.28
January 1, 2019 | Market-indexed | First vesting period
Share and unit-based plans
Granted (shares)	250,852
Granted (in dollars per share)	$ 29.25
September 1, 2019 | Service-based | First vesting period
Share and unit-based plans
Granted (shares)	4,393
Granted (in dollars per share)	$ 28.53
September 1, 2019 | Market-indexed | First vesting period
Share and unit-based plans
Granted (shares)	6,454
Granted (in dollars per share)	$ 19.42