Credit and Other Debt Agreements - Note Purchase Agreements - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Jun. 30, 2023	Feb. 28, 2023	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Debt instrument, interest rate				6.75%	6.75%
Semi-annual payments of interest				$ 8,032.0	$ 6,499.9
Series G note [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			3.69%
Debt instrument, maturity date			Jun. 14, 2023
Operating cash to fund			$ 200.0
Series N note [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.13%
Debt instrument, maturity date	Jun. 24, 2023
Operating cash to fund	$ 200.0
Series CC note [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 13, 2024
Quarterly payments of interest, description	90 day LIBOR
Quarterly payments of interest rate	1.40%
Prepayment of debt	$ 50.0
Series E note [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		5.49%
Debt instrument, maturity date		Feb. 10, 2023
Operating cash to fund		$ 50.0
Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest				$ 3,948.0	$ 4,248.0
Amount payable to redeem the notes, percent of the principal amount				100.00%
Discount rate used to compute the remaining scheduled payments of principal and interest				U.S. Treasury yield plus 0.5