Interim financial statements (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Management's responsibility	Management’s responsibility. The accompanying interim financial statements were prepared by management, who is responsible for their integrity and objectivity. These financial statements have been prepared in conformity with the United States (U.S.) generally accepted accounting principles (GAAP), including management’s best judgments and estimates. In the opinion of management, all adjustments necessary for a fair presentation of this information for all interim periods, consisting only of normal recurring accruals, have been made. The Company’s results of operations for interim periods are not necessarily indicative of results for a full year and actual results could differ.
Consolidation	Consolidation. The condensed consolidated financial statements include all subsidiaries in which the Company owns more than 50% voting rights in electing directors. All significant intercompany amounts and transactions have been eliminated and provisions have been made for noncontrolling interests. Unconsolidated investees, in which the Company typically owns from 20% to 50% of the voting stock, are accounted for using the equity method.
Restrictions on cash and investments	Restrictions on cash and investments. The Company maintains investments in accordance with certain statutory requirements for the funding of statutory premium reserves. Statutory reserve funds are required to be fully funded and invested in high-quality securities and short-term investments. Statutory reserve funds are not available for current claim payments, which must be funded from current operating cash flow. Included in investments in debt and equity securities are statutory reserve funds of approximately $504.2 million and $483.4 million at June 30, 2020 and December 31, 2019, respectively. In addition, included within cash and cash equivalents are statutory reserve funds of approximately $39.4 million and $39.7 million at June 30, 2020 and December 31, 2019, respectively. Although these cash statutory reserve funds are not restricted or segregated in depository accounts, they are required to be held pursuant to state statutes. If the Company fails to maintain minimum investments or cash and cash equivalents sufficient to meet statutory requirements, the Company may be subject to fines or other penalties, including potential revocation of its business license. These funds are not available for any other purpose. In the event that insurance regulators adjust the determination of the statutory premium reserves of the Company’s title insurers, these restricted funds as well as statutory surplus would correspondingly increase or decrease.