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Significant Accounting Policies (Details) - Series A Preferred Stock [Member] - USD ($) $ in Millions | Jan. 01, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Carrying value |  | $ 749.7 | $ 749.7 | $ 301.4 | $ 297.0 | $ 287.8 | $ 278.8
New Accounting Pronouncement Early Adoption Effect [Member] | ASU 2020-06 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |
Carrying value | $ 749.7 |  |  |  |  |  |
Preferred stock, net proceeds at issuance | $ 787.1 |  |  |  |  |  |

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