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Fair Value of Financial Instruments - Schedule of Financial Instruments Measured on Not Measured at Fair Value (Details) - Nonrecurring - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
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	712.3	626.3
Total liabilities not accounted for at fair value	712.3	626.3
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	643.0	648.2
Total liabilities not accounted for at fair value	643.0	648.2
Estimated Fair Value | 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
Estimated Fair Value | 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	643.0	648.2
Total liabilities not accounted for at fair value	643.0	648.2
Estimated Fair Value | 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

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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