Qualified Employee Benefit Plans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) investments	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions to qualified profit sharing plan	$ 15,600,000	$ 14,400,000	$ 15,000,000.0
Defined contribution expense for foreign entities	8,400,000	7,700,000	7,100,000
Other comprehensive (loss) gain	(4,443,000)
Loss to be amortized over next fiscal year	$ 1,400,000	1,100,000	1,100,000
Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	20.00%
Retirement plan, number of investments | investments	3
Return Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	27.00%
Risk Mitigating Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	14.00%
Diversifying Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	21.00%
Dynamic Asset Allocation
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	18.00%
Equity mutual fund
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	7
U.S. Based Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	4
Non-U.S. Based Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	3
Equity Private Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	1
Collective Investment Trust
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	1
Minimum | Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	10.00%
Minimum | Return Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	15.00%
Minimum | Risk Mitigating Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	5.00%
Minimum | Diversifying Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	10.00%
Minimum | Dynamic Asset Allocation
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	5.00%
Maximum | Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Maximum | Return Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	40.00%
Maximum | Risk Mitigating Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Maximum | Diversifying Investments
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Maximum | Dynamic Asset Allocation
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations, percent	35.00%
Fixed Income Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	2
Fixed Income Mutual Funds | U.S. Based Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	1
Fixed Income Mutual Funds | Non-U.S. Based Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Retirement plan, number of investments | investments	1
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 0	4,000,000
Other comprehensive (loss) gain	(4,281,000)	(7,598,000)	1,687,000
Discount rate and lump sum interest rates	(16,700,000)	(21,700,000)	9,700,000
Earnings of plan assets exceeding expectations	10,400,000	11,300,000	9,200,000
Mortality assumption	$ (1,000,000.0)	1,200,000	400,000
Defined benefit plan, amortization period	29 years 10 months 24 days
Loss to be amortized over next fiscal year	$ 1,500,000
Changes in census data	400,000	100,000	$ 200,000
Future amortization of prior service cost	24,000
Accumulated benefit obligation	$ 151,100,000	$ 136,100,000
Assumptions used calculating benefit obligation, discount rate, percent	2.55%	3.35%
Expected long-term rate of return on plan assets	5.50%	5.75%	5.75%