Employee Benefit Plans - Defined Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans
Projected benefit obligation
Beginning of year	$ 170,000,000.0	$ 186,400,000
Service cost	2,300,000	3,000,000.0	$ 3,000,000.0
Interest cost	3,300,000	2,800,000	4,500,000
Plan amendments	200,000	0
Actuarial gains	(26,600,000)	(7,900,000)
Benefits paid	(13,200,000)	(14,300,000)
End of year	136,000,000.0	170,000,000.0	186,400,000
Fair value of plan assets
Beginning of year	149,200,000	162,400,000
Actual loss on plan assets	(24,600,000)	(400,000)
Company contributions	3,500,000	1,500,000
Benefits paid	(13,200,000)	(14,300,000)
End of year	114,900,000	149,200,000	$ 162,400,000
(Unfunded) funded status end of year	(21,100,000)	(20,800,000)
Accumulated benefit obligation at end of year	134,800,000	169,700,000
Amounts included in accumulated other comprehensive loss
Unrecognized actuarial losses (gross)	49,200,000	46,700,000
Unrecognized actuarial losses (net of tax)	38,100,000	37,500,000
Unrecognized prior service costs (gross)	600,000	400,000
Unrecognized prior service costs (net of tax)	400,000	300,000
Executive supplemental and director defined benefit pension plans
Projected benefit obligation
Beginning of year	21,300,000
End of year	19,000,000	21,300,000
Fair value of plan assets
Beginning of year	0
Company contributions	1,500,000	1,500,000
End of year	0	0
Accumulated benefit obligation at end of year	$ 17,700,000	$ 21,100,000