Debt - Selected Information about Debt Issues (Details) - USD ($)	May 19, 2022	Dec. 31, 2022	Sep. 15, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, par value, gross		$ 1,815,612,000
Current maturity of long-term debt, par value		165,612,000
Total long-term debt		1,650,000,000
Total short-term debt, par value		450,612,000
Total debt, par value		2,100,612,000
Unamortized discount & issuance costs, noncurrent		(22,160,000)
Unamortized discount & issuance costs, current maturities		(112,000)
Unamortized discount & issuance costs, long-term debt		(22,048,000)
Unamortized discount & issuance costs, current		(1,509,000)
Total debt, unamortized discount & issuance costs,		(23,557,000)
Debt		2,077,055,000		$ 2,026,138,000
Long-term debt, net, book value		1,793,452,000		1,696,246,000
Current maturity of long-term debt, book value		165,500,000		149,752,000
Long-term debt		1,627,952,000		1,546,494,000
Total short-term debt, book value		449,103,000		479,644,000
Total debt, book value		2,077,055,000		2,026,138,000
Long-term debt, gross, fair value		1,607,096,000
Current maturity of term loan, fair value		166,819,000
Long-term debt, net, fair value		1,440,277,000
Total short-term debt, fair value		450,423,000
Total debt, fair value		1,890,700,000
Commercial Paper
Debt Instrument [Line Items]
Total short-term debt, par value		285,000,000
Unamortized discount & issuance costs, current		(1,397,000)
Total short-term debt, book value		283,603,000		329,892,000
Total short-term debt, fair value		$ 283,604,000
Senior Notes Due 2023
Debt Instrument [Line Items]
Coupon Rate		7.875%
Long-term debt, par value, gross		$ 165,612,000
Unamortized discount & issuance costs, noncurrent		(112,000)
Debt		165,500,000		165,216,000
Long-term debt, gross, fair value		166,819,000
Senior Notes Due 2022
Debt Instrument [Line Items]
Coupon Rate	3.80%		3.80%
Debt				149,752,000
Debt repayment	$ 300,000,000
Borrowed money from affiliate	$ 150,000,000
Senior Notes Due 2022 | Consolidation Eliminations | Subsidiaries
Debt Instrument [Line Items]
Long-term debt, net, book value		$ 150,000,000
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		(4,399,000)
Debt		545,601,000		544,949,000
Long-term debt, gross, fair value		$ 534,501,000
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		(3,781,000)
Debt		396,219,000		395,778,000
Long-term debt, gross, fair value		$ 314,996,000
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		(4,507,000)
Debt		245,493,000		0
Long-term debt, gross, fair value		$ 236,263,000
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		(1,590,000)
Debt		123,410,000		123,396,000
Long-term debt, gross, fair value		$ 121,817,000
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		(7,771,000)
Debt		317,229,000		$ 317,155,000
Long-term debt, gross, fair value		$ 232,700,000