Legal Proceedings	6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings	9. Legal Proceedings CNA Financial In September of 2016, a class action lawsuit was filed against CCC, Continental Assurance Company (“CAC”) (a former subsidiary of CCC), CNA, the Investment Committee of the CNA 401(k) Plus Plan (“Plan”), The Northern Trust Company and John Does 1-10 (collectively “Defendants”) related to the Plan. The complaint alleges that Defendants breached fiduciary duties to the Plan and caused prohibited transactions in violation of the Employee Retirement Income Security Act of 1974 when the Plan’s Fixed Income Fund’s annuity contract with CAC was canceled. The plaintiff alleges he and a proposed class of the Plan participants who had invested in the Fixed Income Fund suffered lower returns in Plan investments as a consequence of these alleged violations and seeks relief on behalf of the putative class. The Plan trustees have provided notice to their fiduciary coverage insurance carriers. The plaintiff, Defendants and the Plan’s fiduciary insurance carriers have agreed on terms to settle this matter and have executed settlement agreements. The plaintiff and Defendants have proposed a class settlement for court approval, and the court granted preliminary approval subject to a fairness hearing. Based on the executed settlement agreements, management has recorded its best estimate of CNA’s probable loss and does not believe that the ultimate resolution of this matter will have a material impact on its consolidated financial statements. Other Litigation The Company and its subsidiaries are from time to time parties to other litigation arising in the ordinary course of business. While it is difficult to predict the outcome or effect of any litigation, management does not believe that the outcome of any such pending litigation will materially affect the Company’s results of operations or equity.

9. Legal Proceedings

CNA Financial

In September of 2016, a class action lawsuit was filed against CCC, Continental Assurance Company (“CAC”) (a former subsidiary of CCC), CNA, the Investment Committee of the CNA 401(k) Plus Plan (“Plan”), The Northern Trust Company and John Does 1-10 (collectively “Defendants”) related to the Plan. The complaint alleges that Defendants breached fiduciary duties to the Plan and caused prohibited transactions in violation of the Employee Retirement Income Security Act of 1974 when the Plan’s Fixed Income Fund’s annuity contract with CAC was canceled. The plaintiff alleges he and a proposed class of the Plan participants who had invested in the Fixed Income Fund suffered lower returns in Plan investments as a consequence of these alleged violations and seeks relief on behalf of the putative class. The Plan trustees have provided notice to their fiduciary coverage insurance carriers.

The plaintiff, Defendants and the Plan’s fiduciary insurance carriers have agreed on terms to settle this matter and have executed settlement agreements. The plaintiff and Defendants have proposed a class settlement for court approval, and the court granted preliminary approval subject to a fairness hearing. Based on the executed settlement agreements, management has recorded its best estimate of CNA’s probable loss and does not believe that the ultimate resolution of this matter will have a material impact on its consolidated financial statements.

Other Litigation

The Company and its subsidiaries are from time to time parties to other litigation arising in the ordinary course of business. While it is difficult to predict the outcome or effect of any litigation, management does not believe that the outcome of any such pending litigation will materially affect the Company’s results of operations or equity.