Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Significant non-cash investing and financing activities
Other payables issued for agency acquisitions and purchased customer accounts	$ 0.2
Estimated acquisition earn-out payables issued for agency acquisitions	$ 19.6	$ 10.8