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Equity (Details) - $ / shares
shares in Millions
Sep. 30, 2019
May 08, 2019
Dec. 31, 2018
Nov. 16, 2018
May 09, 2018
May 08, 2018
Stockholders' Equity Note [Abstract]            
Share price   $ 11.10   $ 11.05 $ 11.05 $ 11.00
OP units outstanding, shares 42.7   44.5      
Subsidiaries            
Noncontrolling Interest [Line Items]            
Noncontrolling interest, ownership percentage 25.00%