Goodwill and Other Intangible Assets - Additional Information (Details) - Town & Country Insurance Agency, Inc. - Unrelated Third Party $ in Millions	May 31, 2018 USD ($)
Goodwill And Other Intangible Assets [Line Items]
Sale of net assets	$ 11.1
Goodwill and Intangible Assets
Goodwill And Other Intangible Assets [Line Items]
Sale of net assets	$ 10.9