Debt - Narrative (Details)			1 Months Ended	12 Months Ended
	Mar. 10, 2022 USD ($) deferral_period	Jun. 04, 2019 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 15, 2022 USD ($)	Sep. 22, 2020	Jun. 08, 2018 USD ($)	Feb. 28, 2015 USD ($)
Debt Instrument [Line Items]
Long-term Debt				$ 1,391,600,000	$ 1,389,200,000
Interest expense				56,900,000	56,100,000	$ 54,700,000
Interest paid including facility fees				$ 54,500,000	54,500,000	$ 51,500,000
Senior Notes, 4.35 Percent Due February 15, 2025 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate, percentage				4.35%
Long-term debt, gross				$ 450,000,000.0
Debt instrument, face amount										$ 250,000,000.0
Increase in debt instrument			$ 200,000,000.0
Long-term Debt				0	449,600,000
Senior Notes, 2.400 Percent Due September 30, 2030 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate, percentage								2.40%
Long-term debt, gross				400,000,000.0
Proceeds from debt, net of issuance costs				395,800,000
Debt instrument, effective interest rate								2.52%
Long-term Debt				397,500,000	397,000,000.0
Senior Notes, 3.800 Percent Due February 23, 2032
Debt Instrument [Line Items]
Long-term Debt							$ 395,100,000
Senior Notes, 3.800 Percent Due February 23, 2032 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate, percentage							3.80%
Long-term debt, gross				400,000,000
Debt instrument, effective interest rate								3.95%
Long-term Debt				396,500,000	396,000,000.0
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062
Debt Instrument [Line Items]
Long-term Debt	$ 144,700,000
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross				150,000,000
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 | Junior Debt
Debt Instrument [Line Items]
Stated interest rate, percentage	5.875%
Long-term Debt				147,700,000	146,600,000
Debt instrument, basis spread on variable rate	4.14%
Interest deferrals, number of deferral periods | deferral_period	1
Interest deferrals, period (up to)	5 years
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062 | Junior Debt | Five-Year Treasury Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	4.14%
Second Amended and Restated Credit Agreement | Notes Payable under Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum Capacity Amount		$ 800,000,000.0		$ 512,000,000.0					$ 600,000,000.0
Increase in line of credit facility		200,000,000.0
Line of credit, outstanding					$ 0
Debt issuance costs		2,200,000
Unamortized debt issuance expense		$ 1,100,000