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Long Term Subordinated Notes (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) Item	Dec. 31, 2020 USD ($)	May 15, 2022
Debt Instrument [Line Items]
Redemption date	May 01, 2047
Subordinated Debt [Member]
Debt Instrument [Line Items]
Percentage of principal amount required for redemption	100.00%
Outstanding debt reduction	$ 161.4
Gain on repurchase and retirement of debt		$ 13.2
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.60%
Interest payment commencement date	Nov. 15, 2007
Basis spread on variable rate	2.385%
Right to defer interest, number of occasions | Item	1
Debt instrument, maturity date	May 01, 2067
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate			2.89%
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest payment date	May 3, 2007
Subordinated Debt [Member] | 6.6 % Long Term Subordinated Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest payment date	May 14, 2017
Right to defer interest on one or more occasions for up to number of consecutive years	10 years
Senior Notes [Member] | 4.868% Senior Notes due 6/1/2044 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	4.868%
Debt instrument, maturity date	Jun. 01, 2044
Senior Notes [Member] | 3.5% Senior Notes due 10/15/2050 [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate	3.50%
Debt instrument, maturity date	Oct. 15, 2050

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