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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 |  |  |

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