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Summary of Significant Accounting Policies (Carrying Values and Fair Values of Debt Instruments) (Details) - Senior Notes [Member] - USD ($)	12 Months Ended
	Dec. 31, 2021	Sep. 20, 2021	Aug. 31, 2021	Dec. 31, 2020	Jan. 23, 2020
Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 100,000,000			$ 100,000,000
Fair value of senior notes				$ 100,850,000
Interest rate of senior notes				4.64%
Senior note year due	2021
New Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes			$ 150,000,000	$ 150,000,000
Fair value of senior notes				$ 150,695,000
Interest rate of senior notes				2.39%
Senior note year due	2021
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 125,000,000			$ 125,000,000
Fair value of senior notes				$ 128,482,000
Interest rate of senior notes				3.09%
Senior note year due	2022
Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 200,000,000			$ 200,000,000
Fair value of senior notes				$ 206,204,000
Interest rate of senior notes				2.75%
Senior note year due	2023
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes			150,000,000	$ 150,000,000
Fair value of senior notes				$ 158,140,000
Interest rate of senior notes				3.24%
Senior note year due	2024
Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 375,000,000			$ 375,000,000
Fair value of senior notes				$ 403,025,000
Interest rate of senior notes				3.41%
Senior note year due	2025
Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes			400,000,000	$ 400,000,000
Fair value of senior notes				$ 424,874,000
Interest rate of senior notes				3.03%
Senior note year due	2026
Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes			$ 250,000,000	$ 250,000,000
Fair value of senior notes				$ 271,198,000
Interest rate of senior notes				3.49%
Senior note year due	2027
Senior Notes due 2028 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 500,000,000			$ 500,000,000
Fair value of senior notes	$ 561,350,000			$ 597,050,000
Interest rate of senior notes	4.25%			4.25%
Senior note year due	2028
Senior Notes due 2029 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 500,000,000			$ 500,000,000
Fair value of senior notes	$ 539,500,000			$ 570,450,000
Interest rate of senior notes	3.50%			3.50%
Senior note year due	2029
Senior Notes due 2030 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 600,000,000			$ 600,000,000
Fair value of senior notes	$ 610,440,000			$ 644,520,000
Interest rate of senior notes	2.60%			2.60%	2.60%
Senior note year due	2030
Senior Notes due 2032 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 650,000,000
Fair value of senior notes	$ 637,065,000
Interest rate of senior notes	2.20%	2.20%
Senior note year due	2032
Senior Notes due 2050 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 500,000,000			$ 500,000,000
Fair value of senior notes	$ 496,350,000			$ 540,050,000
Interest rate of senior notes	3.05%			3.05%
Senior note year due	2050
Senior Notes due 2052 [Member]
Debt Instrument [Line Items]
Carrying value of senior notes	$ 850,000,000
Fair value of senior notes	$ 828,580,000
Interest rate of senior notes	2.95%	2.95%
Senior note year due	2052

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Contractual interest rate for funds borrowed, under the debt agreement.

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