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Equity - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  |  | 15,250,000 |  |
Forward equity sales agreement, initial net price (in usd per share) |  |  |  | $ 28.60 |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, net (in shares) |  |  |  | 2,000,000 |  |
Weighted average net price (in usd per share) |  | $ 28.60 |  |  | $ 28.60 |
Proceeds from issuance of common stock |  |  |  | $ 57,000,000 |  |
At-The-Market Program 2018 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
ATM aggregate amount authorized |  |  | $ 1,000,000,000.0 |  |  |
Issuance of common stock, net (in shares) |  |  |  |  |  | 5,400,000
Weighted average net price (in usd per share) |  |  |  | $ 28.27 |  | $ 28.27
Proceeds from issuance of common stock |  |  |  |  |  | $ 154,000,000
At-The-Market Program 2019 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
ATM aggregate amount remaining |  | $ 888,000,000 |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  |  |  | 3,600,000 |
Forward equity sales agreement, initial net price (in usd per share) |  |  |  |  | $ 31.19 |
Option indexed to issuers equity, term |  |  |  |  | 1 year |
Forward Equity Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock, net (in shares) |  |  |  |  | 0 |
Option indexed to issuers equity, term |  |  |  | 1 year |  |
Subsequent Event | At-The-Market Program 2019 |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) | 1,500,000 |  |  |  |  |
Forward equity sales agreement, initial net price (in usd per share) | $ 30.63 |  |  |  |  |
Option indexed to issuers equity, term | 1 year |  |  |  |  |

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