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Segment Reporting - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Segment	Sep. 30, 2023 USD ($)
Segment Reporting Information
Number of reportable segments | Segment			3
Operating revenues	$ 1,315.7	$ 1,352.0	$ 3,951.4	$ 4,127.2
Other | Other Insurance
Segment Reporting Information
Operating revenues	$ 23.9	$ 15.6	$ 73.5	$ 50.0

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