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Capital Stock - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
vote
$ / shares
shares
Nov. 02, 2018
USD ($)
Dec. 31, 2017
$ / shares
shares
Class of Stock [Line Items]        
Common stock, shares authorized (up to) (in shares)   400,000,000   400,000,000
Common stock, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01
Votes per common share | vote   1    
Preferred stock, shares authorized (up to) (in shares)   10,000,000   10,000,000
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.01   $ 0.01
Preferred stock, shares outstanding (in shares)   0   0
Common stock partnership units option redemption ratio   1    
Common Stock        
Class of Stock [Line Items]        
Aggregate offering price (up to) | $   $ 200.0    
Common stock, sold (in shares)   7,472,946    
Shares sold, price per share ( in dollars per share) | $ / shares   $ 12.56    
Proceeds from sale of common stock, net | $   $ 92.9    
Value amount of shares authorized to be repurchased (up to) | $   $ 150.0    
Unaffiliated Third Parties        
Class of Stock [Line Items]        
Operating partnerships units held (in shares)   0   0
Subsequent Event | Common Stock        
Class of Stock [Line Items]        
Value amount of shares authorized to be repurchased (up to) | $     $ 250.0  
Scenario, Forecast        
Class of Stock [Line Items]        
Limited partners' capital account | $ $ 150.0      
Limited partnership, units sold (in shares) 1,200,000      
Limited partnership, price per unit (in dollars per unit) | $ / shares $ 11.76