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Equity - ATM Program (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 29, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  |  |  |  |  |  | 2,000,000.0
Forward rate per share (in usd per share) |  |  |  |  |  |  |  | $ 28.60
Issuance of common stock, net |  |  |  |  | $ 1,060,000,000.00 | $ 1,067,071,000 | $ 791,048,000 | $ 215,179,000
At-The-Market Program |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Aggregate amount authorized | $ 1,250,000,000 |  |  |  |  |  |  |
Settlement alternatives, fair value (in shares) |  | 5,500,000 |  | 16,800,000 | 16,800,000 |  | 5,500,000 |
Issuance of common stock, net |  |  |  | $ 528,000,000 |  |  | $ 171,000,000 |
Forward Equity Offering |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Option indexed to issuers equity, term |  |  | 1 year |  |  | 1 year |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  | 15,300,000 |  |  |  | 15,300,000 |
Forward rate per share (in usd per share) |  |  | $ 28.60 | $ 31.38 |  |  | $ 30.91 |
Issuance of common stock, net |  | $ 422,000,000 |  |  |  |  |  |
Issuance of common stock, net (in shares) |  | 0 |  |  |  |  |  |
Aggregate amount remaining |  |  |  |  |  | $ 1,250,000,000 |  |
2019 ATM Program |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  |  |  |  | 2,000,000.0 | 20,300,000 |
Forward rate per share (in usd per share) |  |  |  |  |  | $ 35.23 | $ 31.44 |
2019 ATM Program, Settled |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock, net (in shares) |  |  |  | 0 |  |  |  |
Forward contract, outstanding (in shares) |  |  |  |  |  | 0 |  |
A T M Direct Issuances |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Sale of stock (in usd per share) |  | $ 31.84 | $ 28.27 |  |  |  | $ 31.84 | $ 28.27
A T M Direct Issuances | Common Stock |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  | $ 189,000,000 | $ 154,000,000
Issuance of common stock, net (in shares) |  |  |  |  |  | 0 | 5,900,000 | 5,400,000

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