Derivatives - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional amount	$ 250,000,000
Accumulated other comprehensive loss, net of tax	(15,000,000)	$ 23,000,000	$ 40,000,000	$ (20,000,000)
Accumulated other comprehensive income (loss), be Reclassified During Next 12 Months	6,000,000
Interest Expense
Derivative [Line Items]
Amount reclassified from accumulated other comprehensive loss to earnings	1,000,000
Interest Rate Swaps A
Derivative [Line Items]
Notional amount	250,000,000
Interest Rate Swaps B
Derivative [Line Items]
Notional amount	250,000,000
Interest Rate Swap C
Derivative [Line Items]
Notional amount	250,000,000
Available-for-sale securities and interest rate swaps
Derivative [Line Items]
Accumulated other comprehensive loss, net of tax	$ (34,000,000)	$ (9,000,000)
LIBOR | Interest Rate Swaps A
Derivative [Line Items]
Fixed interest rate	3.01%
LIBOR | Interest Rate Swaps B
Derivative [Line Items]
Fixed interest rate	3.04%
LIBOR | Interest Rate Swap C
Derivative [Line Items]
Fixed interest rate	2.82%