Debt - Junior Subordinated Debt (Details)	12 Months Ended
	Dec. 31, 2019	Apr. 30, 2017
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate	4.39%	4.39%
Debt Instrument, Payment Terms	The Company has the right to defer interest payments for up to a consecutive ten years without giving rise to an event of default. Deferred interest will continue to accrue and will accrue additional interest at the then applicable interest rate. If the Company defers interest payments, the Company generally may not make payments on or redeem or purchase any shares of its capital stock or any of its debt securities or guarantees that rank upon liquidation, dissolution or winding up equally with or junior to the debentures, subject to certain limited exceptions.
Junior Subordinated Notes Seven Point Eight Seventy Five Percent Due in Two Thousand Forty Two
Debt Instrument [Line Items]
Debt Instrument, Call Date, Earliest	Apr. 15, 2022
Debt Instrument, Maturity Date	Apr. 15, 2042
LIBOR Plus Two Point One Two Five Percent Junior Subordinated Notes Due Two Thousand Sixty Seven
Debt Instrument [Line Items]
Debt Instrument, Call Date, Earliest	Feb. 15, 2022
Debt Instrument, Maturity Date	Feb. 12, 2067
Interest Rate Contract [Member]
Debt Instrument [Line Items]
Derivative, Maturity Date	Feb. 15, 2027