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Issuances of Common Stock - Issuance of Common Stock in Underwritten Public Offering (Details) - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jan. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Class of Stock [Line Items] |  |  |  |  |
Proceeds from share issuances, net |  | $ 669,600,000 | $ 728,500,000 | $ 669,295,000 | $ 728,883,000
Commercial paper program |  |  |  | $ 1,000,000,000.0 |
Subsequent event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from share issuances, net | $ 594,100,000 |  |  |  |
Underwritten Public Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Underwriting discounts |  | $ 19,300,000 | $ 21,500,000 |  |
Underwritten Public Offering | Subsequent event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Underwriting discounts | $ 2,900,000 |  |  |  |
Common stock | Underwritten Public Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares of common stock issued (in shares) |  | 12,075,000 | 9,690,500 |  |
Common stock | Underwritten Public Offering | Subsequent event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares of common stock issued (in shares) | 9,200,000 |  |  |  |
Common stock | Underwriter Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares of common stock issued (in shares) |  | 1,575,000 | 690,500 |  |
Common stock | Underwriter Option | Subsequent event |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares of common stock issued (in shares) | 1,200,000 |  |  |  |

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