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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 |

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- Definition Deferred Compensation Arrangement with Individual, Employer Discretionary Contribution Amount + References No definition available. + Details
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- Definition Increase (Decrease) in Deferred Compensation Plan, Assets + References No definition available. + Details
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- Definition Increase (Decrease) in Deferred Compensation Plan, Liabilities + References No definition available. + Details
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- Definition Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602 + Details
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