Debt - Schedule of Selected Information about Debt Issues (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	May 11, 2023	Dec. 31, 2022	May 19, 2022
Debt Instrument [Line Items]
Long-term debt, par value, gross	$ 1,650,000,000
Current maturity of long-term debt, par value	0
Par Value	1,650,000,000
Total short-term debt, par value	489,000,000
Total debt, par value	2,139,000,000
Unamortized discount & issuance costs, noncurrent	(20,441,000)
Unamortized discount & issuance costs, current maturities	0
Unamortized discount & issuance costs, long-term debt	(20,441,000)
Unamortized discount & issuance costs, current	(2,887,000)
Total debt, unamortized discount & issuance costs,	(23,328,000)
Long-term debt, net, book value	1,629,559,000		$ 1,793,452,000
Current maturity of long-term debt, book value	0		165,500,000
Total long-term debt	1,629,559,000		1,627,952,000
Total short-term debt, book value	486,113,000		449,103,000
Total debt, book value	2,115,672,000		2,077,055,000
Long-term debt, gross, fair value	1,491,229,000
Current maturity of term loan, fair value	0
Fair Value	1,491,229,000
Total short-term debt, fair value	486,113,000
Total debt, fair value	1,977,342,000
Commercial paper
Debt Instrument [Line Items]
Total short-term debt, par value	319,000,000
Unamortized discount & issuance costs, current	(2,436,000)
Total short-term debt, book value	316,564,000		283,603,000
Total short-term debt, fair value	$ 316,564,000
Senior Notes Due 2023
Debt Instrument [Line Items]
Coupon Rate	7.875%	7.875%
Long-term debt, par value, gross	$ 0	$ 170,000,000
Unamortized discount & issuance costs, noncurrent	0
Debt	0		165,500,000
Long-term debt, gross, fair value	0
Senior Notes Due 2028
Debt Instrument [Line Items]
Coupon Rate				4.55%
Long-term debt, par value, gross	550,000,000
Unamortized discount & issuance costs, noncurrent	(3,717,000)
Debt	546,283,000		545,601,000
Long-term debt, gross, fair value	$ 545,495,000
Senior Notes Due 2030
Debt Instrument [Line Items]
Coupon Rate	2.15%
Long-term debt, par value, gross	$ 400,000,000
Unamortized discount & issuance costs, noncurrent	(3,330,000)
Debt	396,670,000		396,219,000
Long-term debt, gross, fair value	$ 335,096,000
Senior Notes Due June 15 2032
Debt Instrument [Line Items]
Coupon Rate	4.80%
Long-term debt, par value, gross	$ 250,000,000
Unamortized discount & issuance costs, noncurrent	(4,127,000)
Debt	245,873,000		245,493,000
Long-term debt, gross, fair value	242,704,000
Senior Notes Due June 15 2032 | Consolidation Eliminations | Subsidiaries
Debt Instrument [Line Items]
Long-term debt, net, book value	$ 150,000,000
Junior Subordinated Debentures Due 2057
Debt Instrument [Line Items]
Coupon Rate	5.275%
Long-term debt, par value, gross	$ 125,000,000
Unamortized discount & issuance costs, noncurrent	(1,573,000)
Debt	123,427,000		123,410,000
Long-term debt, gross, fair value	$ 120,674,000
Junior Subordinated Debentures Due 2061
Debt Instrument [Line Items]
Coupon Rate	4.25%
Long-term debt, par value, gross	$ 325,000,000
Unamortized discount & issuance costs, noncurrent	(7,694,000)
Debt	317,306,000		317,229,000
Long-term debt, gross, fair value	$ 247,260,000
Term Loan Due November 11 2024
Debt Instrument [Line Items]
Coupon Rate	6.74%
Long-term debt, par value, gross	$ 170,000,000
Unamortized discount & issuance costs, noncurrent	(451,000)
Debt	169,549,000		$ 0
Long-term debt, gross, fair value	$ 169,549,000
Term Loan Due November 11 2024 | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread	1.35%