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Capital - Distributions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]        
Distributions paid to OP unitholders $ 31.9 $ 31.5 $ 95.3 $ 94.5
Distributions paid to preferred unitholders $ 0.2 $ 0.2 $ 0.7 $ 0.7