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Financings and Capitalization (Forward Stock Contracts) (Details) - $ / shares | Sep. 30, 2020 | Sep. 15, 2020 | Feb. 21, 2019 | Nov. 20, 2018
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Forward Contracts Entered Into November 2018 and Maturing March 2021 |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Number of Shares |  |  |  | 777,899
Initial forward price (in dollars per share) | $ 48.83 |  |  | $ 50.91
Forward Contracts Entered into February 2019 and Maturing March 2021 |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Number of Shares |  |  | 2,083,340 |
Initial forward price (in dollars per share) | 50.39 |  | $ 52.27 |
Forward Contracts Entered Into September 15, 2020 And Maturing December 31, 2021 |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Number of Shares |  | 846,759 |  |
Initial forward price (in dollars per share) | $ 61.04 | $ 61.06 |  |

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