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Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Number of reportable segments | Segment | 4 |  |
Average Annual EBITDA, Operating Profit Earned Period Maximum | 3 years |  |
Accumulated impairment losses | $ 0 |  |
Goodwill impairment loss | 0 | $ 0 | $ 0
Long-term Debt, Fair Value | 1,548,200,000 | $ 1,548,200,000 |
Revolving and term loan | 560,000,000.0 |  |
Amounts due from reinsurance carriers | $ 0 |  |
Minimum |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 39 years |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
ASU 2018-15 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
ASU 2017-04 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Impairment charges | $ 0 |  |
ASU 2016-13 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | Jan. 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |

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