Equity	12 Months Ended
Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Equity	Note 9 — Equity Dividends declared per common share were $1.80 for each of the years ended December 31, 2014, 2013 and 2012 and are paid on outstanding common shares. In addition, dividends equivalent amounts are paid on outstanding restricted stock units and amounted to $5.5 million, $6.2 million and $5.6 million for the years ended December 31, 2014, 2013 and 2012, respectively, and are included in dividends paid on the consolidated statements of cash flows. In the event a restricted stock unit holder’s employment is terminated, a portion of the dividend equivalent may be required to be paid back (a "clawback") to the Company and is netted against the dividend equivalent amounts. See “Note 12 — Restricted Stock Units”. During 2014, 1,019,989 restricted stock units vested and were issued as common stock of which the Company is deemed to have repurchased 404,611 shares at an average price of $51.26 per share in conjunction with the payment of tax liabilities in respect of stock delivered to its employees in settlement of restricted stock units. In addition, during 2014 the Company repurchased in open market transactions 334,935 shares of its common stock at an average price of $46.09. During 2013, 693,691 restricted stock units vested and were issued as common stock of which the Company is deemed to have repurchased 226,505 shares at an average price of $56.83 per share in conjunction with the payment of tax liabilities in respect of stock delivered to its employees in settlement of restricted stock units. In addition, during 2013 the Company repurchased in open market transactions 853,870 shares of its common stock at an average price of $49.81. In connection with the acquisition of Greenhill Australia in April 2010, the Company issued 1,099,877 shares of contingent convertible preferred stock ("Performance Stock"). The Performance Stock does not pay dividends, was issued in tranches of 659,926 shares and 439,951 shares, and converts to shares of the Company’s common stock promptly after the third and fifth anniversaries of the closing of the acquisition, respectively, if certain separate revenue targets are achieved. During 2012, the revenue target for the first tranche was achieved and on April 1, 2013, the third anniversary of the closing, 659,926 shares of Performance Stock, which had a fair value of $32.5 million at the acquisition date, were converted to common stock. If the revenue target for the second tranche is achieved, the Performance Stock in that tranche will be converted to common stock on April 1, 2015. If the revenue target for the second tranche is not achieved, the Performance Stock in that tranche will be canceled. Based on the revenues generated since April 1, 2013, we believe it is more likely than not that the revenue target for the second tranche will not be achieved and the remaining Performance Stock will be canceled. See "Note 10 — Earnings per Share".

Equity

12 Months Ended

Dec. 31, 2014

Stockholders' Equity Note [Abstract]

Note 9 — Equity

Dividends declared per common share were $1.80 for each of the years ended December 31, 2014, 2013 and 2012 and are paid on outstanding common shares. In addition, dividends equivalent amounts are paid on outstanding restricted stock units and amounted to $5.5 million, $6.2 million and $5.6 million for the years ended December 31, 2014, 2013 and 2012, respectively, and are included in dividends paid on the consolidated statements of cash flows. In the event a restricted stock unit holder’s employment is terminated, a portion of the dividend equivalent may be required to be paid back (a "clawback") to the Company and is netted against the dividend equivalent amounts. See “Note 12 — Restricted Stock Units”.

During 2014, 1,019,989 restricted stock units vested and were issued as common stock of which the Company is deemed to have repurchased 404,611 shares at an average price of $51.26 per share in conjunction with the payment of tax liabilities in respect of stock delivered to its employees in settlement of restricted stock units. In addition, during 2014 the Company repurchased in open market transactions 334,935 shares of its common stock at an average price of $46.09.

During 2013, 693,691 restricted stock units vested and were issued as common stock of which the Company is deemed to have repurchased 226,505 shares at an average price of $56.83 per share in conjunction with the payment of tax liabilities in respect of stock delivered to its employees in settlement of restricted stock units. In addition, during 2013 the Company repurchased in open market transactions 853,870 shares of its common stock at an average price of $49.81.

In connection with the acquisition of Greenhill Australia in April 2010, the Company issued 1,099,877 shares of contingent convertible preferred stock ("Performance Stock"). The Performance Stock does not pay dividends, was issued in tranches of 659,926 shares and 439,951 shares, and converts to shares of the Company’s common stock promptly after the third and fifth anniversaries of the closing of the acquisition, respectively, if certain separate revenue targets are achieved. During 2012, the revenue target for the first tranche was achieved and on April 1, 2013, the third anniversary of the closing, 659,926 shares of Performance Stock, which had a fair value of $32.5 million at the acquisition date, were converted to common stock. If the revenue target for the second tranche is achieved, the Performance Stock in that tranche will be converted to common stock on April 1, 2015. If the revenue target for the second tranche is not achieved, the Performance Stock in that tranche will be canceled. Based on the revenues generated since April 1, 2013, we believe it is more likely than not that the revenue target for the second tranche will not be achieved and the remaining Performance Stock will be canceled. See "Note 10 — Earnings per Share".