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