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Supplementary Financial Information - Schedule of Financial Instruments Measured on Not Measured at Fair Value (Details) - Nonrecurring - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Level 1 |  |
Assets |  |
Other invested assets | $ 0.0 | $ 0.0
Total assets not accounted for at fair value | 0.0 | 0.0
Liabilities |  |
Debt obligations | 0.0 | 0.0
Total liabilities not accounted for at fair value | 0.0 | 0.0
Level 2 |  |
Assets |  |
Other invested assets | 0.0 | 0.0
Total assets not accounted for at fair value | 0.0 | 0.0
Liabilities |  |
Debt obligations | 692.7 | 579.2
Total liabilities not accounted for at fair value | 692.7 | 579.2
Level 3 |  |
Assets |  |
Other invested assets | 11.3 | 11.3
Total assets not accounted for at fair value | 11.3 | 11.3
Liabilities |  |
Debt obligations | 0.0 | 0.0
Total liabilities not accounted for at fair value | 0.0 | 0.0
Carrying Value |  |
Assets |  |
Other invested assets | 11.3 | 11.3
Total assets not accounted for at fair value | 11.3 | 11.3
Liabilities |  |
Debt obligations | 676.3 | 560.7
Total liabilities not accounted for at fair value | 676.3 | 560.7
Estimated Fair Value |  |
Assets |  |
Other invested assets | 11.3 | 11.3
Total assets not accounted for at fair value | 11.3 | 11.3
Liabilities |  |
Debt obligations | 692.7 | 579.2
Total liabilities not accounted for at fair value | $ 692.7 | $ 579.2

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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