Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Deferred Compensation Plans (Details)

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Commitments and Contingencies - Deferred Compensation Plans (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]          
Contributions by employer $ 200,000 $ 200,000 $ 1,000,000 $ 1,000,000  
Employer discretionary contribution amount     0 0  
Deferred compensation liability, noncurrent 69,100,000   69,100,000   $ 58,200,000
Life insurance 68,400,000   68,400,000   $ 56,500,000
Change in fair market value of assets associated with deferred compensation plan (200,000) 2,800,000 5,300,000 1,900,000  
Change in fair market value of liabilities associated with deferred compensation plan $ 0 $ 3,300,000 $ 6,000,000 $ 1,900,000