Schedule II - Condensed Financial Information of Registrant Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Senior Notes Due 2026 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 550.0
Debt Instrument, Interest Rate, Stated Percentage	3.875%	3.875%
Maturity date of debt	Aug. 26, 2026	Aug. 26, 2026
Senior Notes Due 2024 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 400.0
Debt Instrument, Interest Rate, Stated Percentage	4.875%	4.875%
Maturity date of debt	Oct. 01, 2024	Oct. 01, 2024
Senior Notes Due 2051
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Face Amount	$ 650.0
Debt Instrument, Interest Rate, Stated Percentage	3.85%	3.85%
Maturity date of debt	Jun. 11, 2051	Jun. 11, 2051