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Share and Unit-Based Plans Share and Unit-Based Plans - LTIP units granted (Details)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
LTIP Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) | shares 569,136
Average grant date fair value (in dollars per share) | $ / shares $ 51.78
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
4/26/2018 | LTIP, Service-based | 4/26/2018  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted (in shares) | shares 89,637
Average grant date fair value (in dollars per share) | $ / shares $ 55.78